lukewarm; tepid
lenient
「温い」 has another reading with different meanings.
warm; mild; (pleasantly) hot
loose
このお茶は温いですね。
This tea is lukewarm, isn't it.
温い水で手を洗いましたよ。
I washed my hands with lukewarm water.
温くなったコーヒーはあまり美味しくないよね。
Lukewarm coffee doesn't taste very good, does it?