expression, adverb
indiscriminately; regardless of who it is; anyone and everyone
Used when an action is done without caring who the person is, often with a negative or critical tone. Common in phrases like 誰彼かまわず話しかける (talk to anyone and everyone).
彼は誰彼かまわず文句を言う。
He complains to anyone and everyone.
誰彼かまわず声をかけるのはやめてください。
Please stop calling out to people indiscriminately.
A set phrase combining 誰 (who) + 彼 (he/that person) + かまわず (negative continuative of 構う, 'to care about'). Literally 'not caring who or what person', it became a fixed adverbial expression meaning 'indiscriminately (toward people)'.