Gaby

Part of speech: noun

Definitions

1. A foolish, naive, or simple-minded person, often used in an old-fashioned or dialect way to mock someone
2. Someone regarded as a dull or gullible fool, a term of mild contempt used chiefly in Scottish and northern English speech
3. A simpleton or silly person, an informal and dated term for someone who seems slow-witted or easily fooled

Etymology: A "gaby" is a simpleton or gullible person, a dated English term of mild insult. Where it came from is unclear. Nothing firm links it to an older word or a named source, so any explanation would be guesswork.

Synonyms: fool, simpleton, dolt, dunce, nincompoop