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half-arsed(British very informal!) also half-assed (American very informal!)
a half-arsed attempt to do something lacks energy and enthusiasm I made a half-arsed attempt to write the introduction and then went back to bed.
rat-arsed(British very informal) also rat-assed (American very informal)
very drunk They came home completely rat-arsed.
be tight-arsed(British & Australian very informal) also be tight-assed (American very informal)
to be worried about small details that are not important Don't ask Jack to get involved, he's so tight-assed and really irritating.
mod. with a naked posterior exposed; totally naked. (Usually objectionable.) He ran right through the room—totally bare-assed—looking scared as hell.
mod. timid; frightened; cowardly. (Mildly objectionable.) What a candy-assed twit you are!
mod. having large buttocks. (Usually objectionable.) Get your fat-ass self outa my car!
1. mod. wild; exciting. We had a real hairy-ass time on the roller coaster.
2. mod. strong and virile. (Usually objectionable.) This big hairy-ass guy started to push us around.
mod. clumsy; awkward and ineffectual. (Usually objectionable.) She only made a half-ass try at passing the test.
1. mod. sad and depressed. (Usually objectionable.) Man, old Charlie was about the most sorry-ass dude you ever saw.
2. mod. worthless; poor quality. (Usually objectionable.) How much longer do I have to drive this sorry-ass excuse for an automobile?