IPA: /ˈkævɪlər/
KK: /ˈkævɪlər/
A person who complains or finds fault about small issues, often in a petty or trivial way.
He is known as a caviler, always pointing out minor mistakes in others' work.
Caviler → The word originates from the French 'cavalier', meaning a horseman or knight, which itself comes from the Latin 'caballarius' (meaning horseman). A caviler is someone who is often seen as a horseman or knight, but in a more figurative sense, it refers to a person who makes trivial objections or engages in petty disputes.
Think of a 'horseman' ('cavalier') who is often seen as someone who nitpicks or makes trivial objections — that's why a caviler is someone who engages in such behavior.