Forming Adjectives from Nouns: -ful and -less (Careful vs. Careless)

Pattern

Noun + -ful = "full of, characterized by" → careful (full of care).

Noun + -less = "without, lacking" → careless (without care).

Other Common Pairs

• Hope → hopeful / hopeless
• Use → useful / useless
• Pain → painful / painless
• Thought → thoughtful / thoughtless
• Harm → harmful / harmless

Notes

• -ful drops one l (not *carefull).
• Not all nouns take both; some only -ful (joyful, not *joyless), some only -less (countless, not *countful).