Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Thesaurus

poisonous

adjective

Synonyms and Antonyms of poisonous

  1. containing or contaminated with a substance capable of injuring or killing a living thing <some evil person was leaving out poisonous meat for neighborhood dogs to eat> Synonyms envenomed, poison, poisoned, toxic, venomous Related Words contagious, infectious, infective, pathogenic, pestilent, pestilential; baneful, deleterious, harmful, hurtful, injurious, malignant, nocuous, noxious, virulent; unhealthful, unhealthy, unwholesome; calamitous, deadly, fatal, fell, lethal, murderous Near Antonyms beneficial, curative, healthful, healthy, helpful, palliative, remedial, salubrious, salutary, wholesome; benign, harmless, innocuous, inoffensive; nonfatal, nonlethal Antonyms nonpoisonous, nontoxic, nonvenomous





Seen and Heard

What made you want to look up poisonous? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 14, 2016

to hug and kiss another person

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image33683556

How much does a batman (the Turkish unit of measurement) weigh?

2.2 pounds 196.5 pounds 100 pounds 16.96 pounds
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ