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.