To frighten or cause hesitation; to daunt, put off (usually used in the negative), to perturb, to disconcert
Jumping out of an airplane does not faze him, yet he is afraid to ride a roller coaster.
If something fazes you, it surprises, shocks, or frightens you, so that you do not know what to do. Big concert halls do not faze Melanie. To disrupt the composure of; disconcert. See Synonyms at embarrass. if a new or difficult situation fazes you, it makes you feel confused or shocked, so that you do not know what to do (feeze , from fesian)