nice guy

(Internet slang, sarcastic, derogatory) A man who pretends to be kind and polite with the goal of attracting women, often becoming hostile and misogynistic when their advances are rebuffed; someone affected by nice guy syndrome.

(idiomatic, euphemistic) An inoffensive adult male who desires romantic companionship but who is too bland and uninspiring to be attractive.

Used other than figuratively or idiomatically: see nice, guy.