Compare: 温い vs 温い

温いぬくい

warm; mild; (pleasantly) hot

温いぬるい

lukewarm; tepid

ぬくい温い
N3I-adjective

warm; mild; (pleasantly) hot

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ぬるい温い
N5CommonI-adjective

lukewarm; tepid

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Examples

このコーヒーはぬるいです。

This coffee is not hot enough.

風呂がぬるくて(はいる)った気がしなかった。

The bath was not hot enough and I was unable to enjoy it.