Lous"y (?), a.
1.
Infested with lice.
2.
Mean; contemptible; as, lousy knave.
[Vulgar]<-- informal but common(1950-96) -->
Such lousy learning as this is.
Bale.
<-- 3. very bad [RH2: "wretchedly bad"]. To feel lousy; to do a lousy job. -->
© Webster 1913.