(an instance of) denying; refusing a request

dismissal, refusal of belief in

careful, tactful, in what one says or does

cautious, sensible

not agreeing to or expressing a definite decision or opinion

moderate

too cautious

suspicious

(of a person, character) slow to express feelings or opinions; (of a seat in a train, room in a hotel etc) kept for a person's later use

silent, unsociable; constrained