nitwit
UK[ˈnɪtwɪt]US[ˈnɪtwɪt]
n
a silly or foolish person
Etymology
the word 'nitwit' is a relatively modern english coinage, first appearing in the early 20th century. it is a humorous compound formed from 'nit', a term for a louse egg implying something trivial or worthless, and 'wit', meaning mind or intelligence. the literal combination suggests a mind occupied with trivialities or a person of negligible intelligence. its formation follows a pattern of creating colloquial insults by pairing a disparaging element with a word for mental faculty, resulting in a term for a foolish person.
Analysis
this word is a compound of two slang or dialectal elements, 'nit' and 'wit', which are not productively used morphemes in modern english. 'nit' is likely from the middle english 'nit', meaning the egg of a louse, used figuratively for something small and insignificant. 'wit' comes from old english 'witt', meaning intelligence or understanding.
Examples
don't be such a nitwit and remember to lock the door.
he felt like a complete nitwit after realizing his mistake.
the character in the comedy is a loveable nitwit who always gets into trouble.