Crossword Dictionary

lukewarm, tepid - a 
moderately warm; "he hates lukewarm coffee"; "tepid bath water" 

Examples:

Please bring my tea to me at a mild, tepid temperature.

Draw a tepid bath so you can clean off the muck from tonight's football game.

If the water is nice and tepid I may hop in the river for a refreshing swim.

James doesn't like coffee if it's hot enough to burn his tongue; make sure it cools off to a tepid temperature before taking it to him.

In the winter our pipes freeze up, meaning our water only ever warms up to a tepid level.

TEPID

tepid, tepefy, tepidly, lew, tepider, tepidest - a 
moderately warm 

wordplays

Synonyms

heated, hottish, lukewarm, toasty, warm, warmed, warmish

merriam-webster

Examples

“She lifted her canteen and allowed herself a swallow of the tepid water.”

“My problem with Starbucks is that the coffee is never actually hot, just tepid.”

“There are copper-mines in the neighbourhood, as well as tepid saline springs, the waters of which are used for bathing, and are much frequented in summer.”

yourdictionary

Etymology

c. 1400, from Latin tepidus "lukewarm," from tepere "be moderately warm," from PIE root *tep- "to be hot" (source also of Sanskrit tapati "makes warm, heats, burns," tapas "heat, austerity;" Avestan tafnush "fever;" Old Church Slavonic topiti "to warm," teplu "warm;" Old Irish tene "fire;" Welsh tes "heat"). Related: Tepidly; tepidity.

etymonline