i-adjective
friendly; approachable; easy to get along with
Describes a person, manner, or atmosphere that feels warm and easy to approach. Often used for someone who is easy to talk to or befriend.
彼はとても親しみやすい人だ。
He is a very approachable person.
この店は親しみやすい雰囲気ですね。
This shop has a friendly atmosphere, doesn't it?
親しい means 'close' or 'intimate' (already familiar), while 親しみやすい describes someone or something that is easy to become close to.
気さく also means 'friendly' or 'unpretentious', but often implies a casual, easygoing personality. 親しみやすい focuses more on the approachable quality that invites closeness.
Compound of 親しみ (noun form of 親しむ 'to be familiar with') + やすい ('easy to').