deadly

/ˈdɛdli/
adverb
  1. Extremely or very much (used for emphasis).
    • He looked deadly pale after hearing the news.
    • The exam was deadly difficult; nobody passed.
    • She was deadly serious about her training schedule.
adjective
  1. Causing or able to cause death.
    • Driving while texting can be a deadly mistake.
    • The snake's venom is deadly to humans.
    • A deadly virus spread quickly through the town.
  2. Extremely effective or powerful, often in a negative way.
    • Her deadly aim made her the best archer in the competition.
    • The comedian's timing was absolutely deadly; the audience couldn't stop laughing.
    • He has a deadly sense of humor that sometimes offends people.
  3. Very boring or dull.
    • The lecture was deadly, and half the class fell asleep.
    • The party was deadly until the music started.
    • I found the movie deadly and almost walked out.
Antonyms
What does "deadly" mean? | whatsthatwordmean | whatsthatwordmean