foul-mouthed

the compound adjective 'foul-mouthed' is a straightforward combination of two english elements. 'foul' originates from old english 'fūl', which carried the core sense of being putrid, dirty, or morally offensive. 'mouthed' derives from old english 'mūþ', meaning the physical mouth or opening. when combined with the adjectival suffix '-ed', it forms a descriptive term for someone possessing a mouth characterized by foulness. the logic is entirely transparent: the literal meaning of 'having a foul mouth' evolved into the modern abstract sense of habitually using offensive or obscene speech.

Structure: foul + mouthed foul (old english, meaning 'dirty, unclean, offensive'); mouthed (old english, from 'mūþ' meaning 'mouth', with the suffix '-ed' indicating 'having a specified kind of mouth')