TEPIDLY

lukewarmly, tepidly

(adverb) in an unenthusiastically lukewarm manner; “he was lukewarmly received by his relatives”

Source: WordNet® 3.1

Etymology

Adverb

tepidly (comparative more tepidly, superlative most tepidly)

In a tepid or halfhearted manner.

Source: Wiktionary

TEPID

Tep"id, a. Etym: [L. tepidus, fr. tepere to be warm; akin to Skr. tap to be warm, tapas heat.]

Definition: Moderately warm; lukewarm; as, a tepid bath; tepid rays; tepid vapors.

– Tep"id*ness, n.

Source: Webster’s Unabridged Dictionary 1913 Edition