to be too difficult for (a person) to do, understand etc

perplex

to fill (a person) with confusion

confuse

to make (a person) feel uncertain, puzzled etc

bewilder someone

to weaken the cottage, confidence, self-discipline etc of (e.g. an army)

depress, unnerve

to upset the calmness or confidence of (a person)

shake up; confuse

to astonish (a person)

astound, confuse

to make (a person) feel uncomfortable, ashamed etc

cause mental discomfort

to affect (a person, animal) with paralysis; to make (a person, animal) helpless

immobilize

to puzzle or confuse (a person)

confuse, mix up

a question or problem that is difficult to understand or answer; a game, toy etc designed to test a person's knowledge, skill or patience; to cause (a person) to become confused, worried (about the solution to a problem)

baffle, confuse

an indoor game played by hitting 1 white ball, 15 red balls and 6 balls of other colours with a long stick (a cue)

frustrate, hinder