Unenthusiastic 

It’s an adjective and it means not having or lacking enthusiasm. If someone is unenthusiastic about something it means they are feeling indifferent, apathetic, passive, phlegmatic, lukewarm, listless, languid, lethargic, emotionless, perfunctory about it.

I’m unenthusiastic about having Malcolm on the team.

Unenthusiastic by AKACroatalin March 24, 2017

unenthusiastic 

It is an opposite meaning of enthusiastic. A type of scepticism. If someone doesn't believe in success.

John was unenthusiastic but gave it a chance for win

unenthusiastic by iGame_again June 27, 2016

unthusiastic

lacking giving a shit, such as the difference between taking home your ex and taking home a new girl. Can also be used in many situations involving boredom and mundane activities.

You seem a little unthusiastic about helping me clean out my basement.

Your obvious unthusiasm tells me you'd rathher pork that girl than go home with me again.

unthusiastic by IWL 67 May 16, 2011

Unenthusiast

(n.) a person who is unenthusiastic about everything and defines their personal by such an intense lack of enthusiasm

Person 1: “Why are you being so mopey?”
Person 2: “I dunno, I’m just an unenthusiast”

Unenthusiast by Rambler369 December 19, 2021