lousy(adjective) adjective1. very bad- a lousy playSimilar word(s): bad, crappy, icky, rotten, stinking, stinky2. infested with lice- burned their lousy clothesSimilar word(s): dirty, soiled, unclean3. vile; despicable- a dirty (or lousy) trickSimilar word(s): awful, nasty, dirty, filthy