to hinder something, to affect, to interfere with something; to harm someone, to be harmful

damage, harm, hinder

(informal) ability to hold a conversation

full-fledged, qualified, up to standard / adulthood, behaving like an adult or as a member of the society / Used other than figuratively or idiomatically: see 一人, 前. ("one person's portion")

affectation

in the middle of a conversation; on the other line of the phone

You'll be convinced if you listen to me.

(colloquial) current boyfriend

everything

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)