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Word Study · Suffixes
Suffixes -ful, -less and -ness: Endings That Change the Job of a Word
Learn what -ful, -less and -ness mean, turn base words into describing and naming words, and spell tricky ones like beautiful and happiness correctly.
The idea
Last time, you learned about prefixes, word parts added to the beginning of a base word. A suffix is a word part added to the end. A suffix changes the meaning, and it often changes the job a word does in a sentence.
-ful means full of: a careful person is full of care. -less means without: a careless person acts without care. These two suffixes make describing words (adjectives). They are often opposites: hopeful and hopeless, useful and useless, fearful and fearless.
-ness means the state of being something. It turns a describing word into a naming word (a noun). Kind becomes kindness. Dark becomes darkness. You can even add two suffixes: careless + ness = carelessness.
Two spelling rules help. First, the suffix -ful always has just one l, even though the word full has two: helpful, not helpfull. Second, when a base word ends in a consonant + y, change the y to i before adding the suffix: happy → happiness, beauty → beautiful, penny → penniless. If a vowel comes before the y, keep the y: play → playful, joy → joyless.
Word bank
careful
adjective · KAIR-fulfull of care; paying close attention so you do not make mistakes
Example: Be careful with the glass beaker.
careless
adjective · KAIR-lesswithout care; not paying enough attention
Example: A careless mistake cost him one point.
helpful
adjective · HELP-fulfull of help; useful to someone
Example: The map was really helpful.
helpless
adjective · HELP-lesswithout help; not able to look after yourself
Example: A newborn baby is helpless.
hopeful
adjective · HOPE-fulfull of hope; expecting something good
Example: We are hopeful that the rain will stop.
hopeless
adjective · HOPE-lesswithout hope; with no chance of success
Example: The lost mitten search seemed hopeless.
fearless
adjective · FEER-lesswithout fear; very brave
Example: The fearless goalie dove for the puck.
useful
adjective · YOOS-fulfull of use; helpful for doing something
Example: A ruler is useful in math class.
useless
adjective · YOOS-lesswithout use; not able to do the job
Example: A pencil with no lead is useless.
kindness
noun · KYND-nessthe state of being kind
Example: Thank you for your kindness.
darkness
noun · DARK-nessthe state of being dark
Example: We walked home in the darkness.
happiness
noun · HAP-ee-nessthe state of being happy (happy → y changes to i)
Example: Her happiness showed in her smile.
beautiful
adjective · BYOO-tih-fulfull of beauty (beauty → y changes to i)
Example: The maple trees look beautiful in October.
playful
adjective · PLAY-fulfull of play; liking to have fun (vowel + y keeps the y)
Example: The playful kitten chased the string.
thoughtful
adjective · THAWT-fulfull of thought; thinking about other people's feelings
Example: It was thoughtful of you to save me a seat.
carelessness
noun · KAIR-less-nessthe state of being careless (two suffixes: care + less + ness)
Example: The spill happened because of carelessness.
Worked examples
Example 1 · Work out a new word
What does painless mean?
- Find the suffix: -less, meaning without.
- Find the base word: pain.
- Put them together: without pain.
Painless means without pain, for example a painless shot at the clinic.
Example 2 · Change the job of a word
Turn the describing word sad into a naming word and use it in a sentence.
- -ness turns a describing word into a noun.
- sad + ness = sadness. Sad ends in d, so nothing changes.
- Use it as a thing: 'Her sadness...'
sadness: Her sadness faded when her friend arrived.
Example 3 · Use the y to i rule
Add -ness to lazy and -ful to pity.
- Lazy ends in a consonant (z) + y, so change y to i: lazi + ness.
- Pity ends in a consonant (t) + y, so change y to i: piti + ful.
- Check -ful has only one l.
laziness, pitiful
Example 4 · Opposites with -ful and -less
Write the opposite of harmful.
- harm + ful means full of harm.
- The opposite of full of is without, so swap -ful for -less.
- harm + less = harmless.
harmless
Common mistakes
Why this fails: The word full has two l's, but the suffix -ful always has one.
Why this fails: When a consonant comes before the y, change y to i: happiness, beautiful.
Why this fails: If a vowel comes before the y, keep it: playful, joyless.
Why this fails: Some do (useful/useless), but not all. 'Beautiless' is not a word; we say plain or ugly instead. Check a dictionary when you are unsure.
Foundation
Foundation practice
What does the suffix mean?
1. What does -less mean in fearless?
- full of
- without
- again
- the state of being
2. What does -ful mean in colourful?
- full of
- without
- before
- not
3. What does -ness do to the word kind?
- It makes it mean the opposite.
- It makes it mean 'again'.
- It turns it into an action word.
- It makes it a naming word: kindness, the state of being kind.
4. care + less = ?
5. What is the opposite of useful?
- unuseful
- useness
- useless
- reuse
Practice
Practice practice
Spell it correctly and choose the word that fits.
6. Which spelling is correct?
- helpfull
- helpful
- helpfil
- helpfoll
7. happy + ness = ?
- happyness
- happness
- happiness
- happinness
8. joy + ful = ?
- joiful
- joyful
- joyfull
- joifull
9. "Thank you for helping me carry the boxes. That was very ___ of you."
- thoughtless
- thoughtfulness
- thought
- thoughtful
10. "We could not see anything in the ___ of the cave."
- darkness
- dark
- darkful
- darker
11. "The old flashlight had no batteries, so it was ___."
- useful
- useless
- usefulness
- reusing
Think
Think practice
Use two suffixes, check real words and explain spelling choices.
12. Break carelessness into its parts and explain its meaning.
13. Which word is NOT a real English word?
- beautiful
- harmless
- beautiless
- fearful
14. Add -ful to plenty. Explain your spelling.
15. Use the word kind in two sentences: once as a describing word and once with -ness as a naming word.
Answer key
- 1. without
Fearless means without fear. - 2. full of
Colourful means full of colour. - 3. It makes it a naming word: kindness, the state of being kind.
-ness turns a describing word into a noun. - 4. careless
Add -less to the base word. Care does not end in y, so nothing changes. - 5. useless
Swap -ful (full of) for -less (without). - 6. helpful
-ful has only one l. - 7. happiness
Happy ends in consonant (p) + y, so the y changes to i. - 8. joyful
Joy ends in vowel (o) + y, so you keep the y. - 9. thoughtful
Thoughtful means thinking about other people's feelings. Thoughtless would mean the opposite. - 10. darkness
The sentence needs a naming word: the darkness. Dark and darker are describing words. - 11. useless
Without batteries it cannot do its job, so it is without use. - 12. care + less + ness: the state of being careless (acting without care).
Read the suffixes from the base word outward: without care, then the state of being that. - 13. beautiless
Beautiful is real, but English does not use beautiless. Not every -ful word has a -less partner. - 14. plentiful: plenty ends in consonant (t) + y, so the y changes to i.
Use the same rule as beauty → beautiful. - 15. Example: My neighbour is kind. Her kindness made my day.
Kind describes a person; kindness names the quality itself.