Adjective: harmful
Comparison Forms
Synthetic
| Comparative | harmfuller |
| Superlative | harmfullest |
Perifrastic
| Comparative | more harmful |
| Superlative | most harmful |
Sample Sentences
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Wear a hat to protect your skin from harmful sunlight.
-
Smoking is harmful to the lungs.
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Burning fossil fuels is harmful to the environment.
Adjectives inflected like harmful
sinful,
painful,
playful,
mournful,
mirthful,
healthful,
awful,
yuriful,
hateful,
harmful,
useful,
joyful,
grateful,
Etymology
1. From Middle English harmful, from Old English *hearmful (suggested by hearmfullīċ (“harmful; hurtful”)), equivalent to harm + -ful.
2. Cognate with German harmvoll, Danish harmfuld, Swedish harmfull.