To me, lukewarm means not warm enough.
(of liquid or food that should be hot) only moderately warm; tepid.
“they drank bitter lukewarm coffee"
synonyms: tepid, slightly warm, warmish, at room temperature, chambré
(of a person, attitude, or action) unenthusiastic.
"the universities were lukewarm about the proposal from the start"
synonyms: indifferent, cool, halfhearted, apathetic, unenthusiastic, tepid, perfunctory, noncommittal, lackadaisical, unenthused;