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Awful; very poor in quality. I've always been lousy with spelling. I've just never cared enough to learn it properly. Wow, the food here is really lousy.
lousy with (something)
Having an abundance of something; having more of something than one needs or knows what to do with. We don't need another accountant—we're lousy with accountants! What we need is someone to overhaul our social media presence. My grandmother was obsessed with taxidermy, so her house was lousy with stuffed bodies of various animals.
lousy with someone or something
Inf. having lots of someone or something. (Like an infestation of lice.) Old Mr. Wilson is lousy with money. Tiffany is lousy with jewels and furs, but she's got bad teeth.
Abundantly supplied, as in He's lousy with money. Like louse up, this expression alludes to being infested with lice. [First half of 1800s]
mod. rotten; poor; bad. This mushy stuff is lousy. Do I have to eat it?
lousy with someone/something
mod. having lots of someone or something. (Like an infestation of lice.) Tiffany is lousy with jewels and furs, but she’s got bad teeth.