1. 淫秽的；猥亵的；下流的
If you describe someone's behaviour as lewd, you are critical of it because it is sexual in a rude and unpleasant way.

1. suggestive of or tending to moral looseness

e.g. lewd whisperings of a dirty old man
an indecent gesture
obscene telephone calls
salacious limericks

Synonym: obsceneraunchysalacious

2. driven by lust
preoccupied with or exhibiting lustful desires

e.g. libidinous orgies

Synonym: lasciviouslibidinouslustful