Winston, still carrying the brief-case containing the book, which had remained between his feet while he worked and under his body while he slept, went home, shaved himself, and almost fell asleep in his bath, although the water was barely more than tepid.
There are no more uses of "tepid" in the book.
Show samples from other sources
And that would leave Jane with her tepid tea and her bone china and these girls who could make an hour’s conversation out of nothing.
Margaret Peterson Haddix -- Uprising
Before dialing, he found it all too easy to imagine that she’d answer with only tepid enthusiasm.