Learner's definition of LOUSY
1 a : bad or poor : of poor quality : not good or skillful
— often + at or with b : not well or healthy c : not happy or pleased d : not pleasant e : not right or proper f — used to make an angry statement or description more forceful
They did a lousy job.
a lousy cook/driver
a lousy performance
: having too much or too many of (something)