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Forgetful or inattentive of everyday details or duties, possibly due to a preoccupation with other thoughts. My absent-minded housemate is always lost in composing new poems and never remembers to clean the house or take out the trash!
An otherwise intelligent person who often lacks common sense or forgets or overlooks important details. Louis is brilliant, but he's such an absent-minded professor when it comes to remembering to attend important meetings.
a bumbling professor who overlooks everyday things. Fred is such an absent-minded professor. He'd forget his head if it wasn't screwed on.
bloody minded(British & Australian informal)
someone who is bloody minded makes difficulties for other people, usually by arguing against their actions or ideas without a good reason There's no reason why we shouldn't do aerobics in the squash court - the sports committee are just being bloody minded.
mod. having a tendency to see the lewd or obscene aspects of anything; having a tendency to place an obscene interpretation on the words and actions of others. Sam is sort of dirty-minded, but he wouldn’t do anything really vile.