be immune to, be insusceptible to, be unaffected by, be unresponsive to, be resistant to, be impervious to
unimpressed - indifferent - apathetic - unexcited - unenthusiastic - lukewarm - half-hearted - listless - uninterested
“Unenthused” describes a state of low or absent excitement, interest, or passion about something. A person who is unenthused might participate, agree, or show up, but without real energy or eagerness. The word often implies mild disappointment, reluctance, or lack of motivation rather than strong dislike. It can refer to reactions to plans, ideas, offers, tasks, or news where someone feels unimpressed or not particularly motivated to engage. In everyday use, it conveys a flat, lukewarm, or half‑hearted attitude, highlighting that something fails to spark genuine enthusiasm or positive emotional investment.