noun, noun which may take the genitive case particle 'no'
lukewarmness; tepidity
Refers to a state of being slightly warm, neither hot nor cold. Often used in a literal sense for liquids or temperatures, but can also be used figuratively to describe a lack of enthusiasm or intensity.
微温のお茶を飲んだ。
I drank lukewarm tea.
彼の微温な態度にがっかりした。
I was disappointed by his lukewarm attitude.