“+ adjective
1. : lacking ardor or excitement : spiritless
an unenthusiastic performance by an orchestra
2. : marked by a lack of sympathy or disinclination to praise : lukewarm
an unenthusiastic review
was … unenthusiastic about most of her relatives — Margaret Mead
3. : not buoyant : not optimistic
unenthusiastic about the prospects of success