faze
v.v. to worry or upset someone, especially when something unexpected happens. You use this when you want to say that a situation does not change your mind or your behavior.
v. to cause a person to feel slightly worried or unsettled, typically in response to an unexpected or unusual event. Often used in the negative to indicate that a situation has no effect on a person's resolve.
I am not fazed by the loud noise.
The sudden change in the schedule did not faze the team, as they had already planned for delays.
From English dialectal (Kentish) feeze, feese (“to alarm, discomfit, frighten”), from Middle English fēsen (“to chase, drive away; put to flight; discomfit, frighten, terrify”), from Old English fēsan, fȳsan (“to send forth; to hasten, impel, stimulate; to banish, drive away, put to flight; to prepare oneself”), from Proto-West Germanic funsijan, from Proto-Germanic funsijaną (“to predispose, make favourable; to make ready”), from Proto-Indo-European *pent- (“to go; to walk”). The word is cognate with Old Saxon fūsian (“to strive”), Old Norse fýsa (“to drive, goad; to admonish”). Citations for faze in the Oxford English Dictionary start in 1830, and usage was established by 1890.