"Louse" is a noun referring to a small insect that infests humans and animals. The word "lousy" originally meant "infested with lice," and later evolved to mean "unpleasant" or "inferior."
"Louse" is a noun referring to a small insect that infests humans and animals. The word "lousy" originally meant "infested with lice," and later evolved to mean "unpleasant" or "inferior."