different between harmful vs poisonous

English

Alternative forms

• harmfull (archaic)

Etymology

From Middle English harmful, from Old English *hearmful (suggested by hearmfull?? (“harmful; hurtful”)), equivalent to harm +? -ful.

Cognate with German harmvoll, Danish harmfuld, Swedish harmfull.

Pronunciation

• (General American) IPA^(key): /?h??mfl?/
• (Received Pronunciation) IPA^(key): /?h??mfl?/

Adjective

harmful (comparative harmfuller or more harmful, superlative harmfullest or most harmful)

1. of a kind likely to be damaging; injurious

   Wear a hat to protect your skin from harmful sunlight.

Usage notes

• Nouns to which "harmful" is often applied: effect, consequence, impact, influence, emission, chemical, ingredient, substance, gas, agent, additive, drug, radiation, dust, organism, plant, animal, insect, action, act, behavior, component, content, activity, interference, use.

Synonyms

• injurious; see also Thesaurus:harmful

Antonyms

• beneficial
• harmless

Translations

See also

• harm

English

Etymology

From Middle English poisounous, poysonouse, equivalent to poison +? -ous.

Pronunciation

• IPA^(key): /?p??z?n?s/, /?p??zn?s/

Adjective

poisonous (comparative more poisonous, superlative most poisonous)

1. Containing sufficient poison to be dangerous to touch or ingest.

   Synonyms: poisoned, toxic, venomous, (dialectal or archaic) attery

   Antonyms: nonpoisonous, unpoisonous

2. (figuratively) Negative, harmful.

   Synonym: toxic

Usage notes

Some speakers make a distinction between poisonous (releasing toxins when eaten), and venomous (releasing toxins (known as venom in this case) by biting a target), especially in non-colloquial speech.

Derived terms

Translations