Pronunciation

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Singular
killer

Plural
killers

  1. Someone who kills. Usually this mean someone who kills other people, and does not have a good reason to kill.
    The police caught the killer today.
    She was happy that her brother's killer was caught.
  2. Something that kills.
    Lighting can be a real killer.
  3. Something that cause problems.
    Failing the exam was a real killer.
  4. (slang) Something that is very exciting.
    The show was great, a real killer.

Synonyms

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Adjective

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Positive
killer

Comparative
none

Superlative
none

  1. If something is killer it kills.
    Watch out! There are killer bees!
    The family barely got away from the killer storm.
  2. (slang) If something is killer it is very good.
    That was a killer show!

Synonyms

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