the.com/tepid

The temperature of indifference, served at exactly the wrong warmth for everything.

means Lukewarm — neither properly hot nor cold — and, by extension, showing no real enthusiasm or conviction.

from Straight from Latin tepidus, 'warm,' built on the verb tepēre, 'to be lukewarm.' That same root warms a small family of words — tepid's cousin tepefy ('to make lukewarm') and the geology term tephra are not related, but the rare verb tepefacient is. The figurative sense — a tepid welcome, tepid applause — is a natural drift: a temperature that fails to commit became a metaphor for feelings that fail to commit.

latin root
From tepidus, meaning lukewarm or moderately warm
baby test
Tepid water is the safe limit for bathing infants
the insult
A tepid review damns harder than a bad one
bacteria zone
Lukewarm food sits in the danger temperature range
for instance

lukewarm water — temperature between 30-35°c (86-95°f), the standard definition in physics and everyday use

tepid lake tanganyika — maintains year-round water temperature around 23-25°c in east africa, notably warmer than expected for its depth

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