To be lecherous is to be full of strong sexual desire and to act on it, usually in an unpleasant way.

People who are lecherous are kind of obsessed with sex — they can't stop thinking about it or having it. This is a word that is used more often to describe men than women: lecherous men are called lechers. There is also a creepy flavor to this word. If you describe someone as lecherous, it usually isn't a compliment. A common use is talking about a lecherous old man who hits on younger women.

Definitions of lecherous
  1. adjective
    given to excessive indulgence in sexual activity
    “a lecherous gleam in his eye”
    “a lecherous good-for-nothing”
    marked by or tending to arouse sexual desire or interest
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