As adjectives the difference between lousiest and mousiest
is that lousiest is (lousy) while mousiest is (mousy).
lousiest
English
Adjective
(head)
(lousy)
lousy
English
Adjective
(er)
Remarkably bad; of poor quality, dirty, or underhanded; mean, contemptible.
* No offense, but your cooking is lousy .
Infested with lice.
(colloquial) Filled or packed with something.
* The place was lousy with students .
* She's lousy with credit cards, goes shopping every day!
Usage notes
Prior to World War II, it was an offensive insult, implying filthiness. Now considered a mild or rather dated term.
Derived terms
* lousy evil
Related terms
* cootie, crab louse, crabs, louse, pubic louse
mousiest
English
Adjective
(head)
(mousy)
mousy
English
Alternative forms
* mousey
Adjective
(
er)
Resembling a mouse
Quiet, stealthy
Timid
A greyish brown colour.
- It's a god-awful small affair to the girl with the mousy hair (1971)