FAZE
TRANSITIVE VERB: To disrupt the composure of; disconcert. See synonyms at embarrass.
ETYMOLOGY: Middle English fesen, to drive away, frighten, from Old English fēsian.
American Heritage Dictionary
-gailrFAZE
1830 Amer.Eng. variant of Kentish dialect feeze "to frighten, alarm, discomfit" (c.1440), from O.E. fesian, fysian "drive away," from P.Gmc. *fausjanan.
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unfazed by the dog days of denver summer...