Friendly and pleasant in manner; affable — someone who is easy to get along with and greets others warmly.
あの店員さんはいつも愛想がいいので、また行きたくなる。
That salesperson is always pleasant, so I want to go back again.
初対面の人にも愛想がいいから、すぐに打ち解ける。
They're friendly even to people they meet for the first time, so they warm up quickly.
先生は授業の中で生徒に愛想がいいが、指導は厳しい。
The teacher is friendly toward students in class, but strict in instruction.
彼女は愛想がいいので接客の仕事に向いている。
She's pleasant with people, so she's suited to customer service work.