noun
losing weight; slimming
Refers to the act or process of losing weight, or the state of being thin. Often used in compounds like やせ我慢 (enduring while pretending to be unaffected).
See also: 痩せる
最近、やせのためにジムに通っている。
Lately, I've been going to the gym to lose weight.
急激なやせは健康に良くない。
Rapid weight loss is not good for your health.
noun
lean person; thin person
Refers to a person who is naturally thin or has lost weight. Can be used descriptively, but may carry a slightly negative nuance if used to describe someone directly.
彼は子どもの頃からやせで、なかなか体重が増えない。
He has been thin since childhood and has trouble gaining weight.
Noun form of the verb 痩せる (yaseru, 'to become thin'). The kanji 痩 is used for thinness or emaciation.