From the thesaurus:
Synonyms: apathetic, cool, disinterested, dull, halfhearted, indifferent, languid, lifeless, mild, milk-warm, moderate, slightly warm, spiritless, temperate, unenthusiastic, unlively, warm, warmish
Antonyms: cold, hot
I see it more as Oshawa (a town in Canada) + Otter