1. containing poison; capable of causing death or serious harm if eaten, drunk, or absorbed
2. having a very harmful or destructive effect
Usage: figurative

Examples

• Many mushrooms found in the wild are poisonous to humans.
• The factory released poisonous chemicals into the river.
• She kept poisonous plants away from her curious toddler.
• The snake’s bite is highly poisonous and requires immediate medical attention.
• His poisonous remarks damaged their friendship permanently.
• The atmosphere at work became poisonous after the layoffs.
• Poisonous gases escaped from the damaged pipeline.