i Register
In some senses, stumblebum is marked as slang. Watch for register when choosing this word.
noun
A blundering or awkward person.
An inept prizefighter.
A homeless person.
A bum came shambling past us.... "Fucking stumblebums," Corsetti said.... "Is 'stumblebum' the acceptable term for our indigent brothers and sisters?" "Sometimes I like 'vagrants,'" Corsetti said. "Depends on how much style they got."