Someone who takes a particular interest in a certain subject, topic, hobby, thing, place or activity to the point where they are experts on said subject. The enthusiast may devote large amounts of time and energy to their subject of interest. At times the subject may be considered esoteric and one's preoccupation with said topic may seem odd, excessive or obsessive to those not interested in it.
My friend James is a Kmart enthusiast. He's been traveling to all remaining Kmarts to take pictures and videos to document the department store chain's slow demise.
by i_like_stuff March 5, 2021
One who possess much thuse.
They are both plumbing enthusiasts.
by Clive & Griswald May 11, 2009
passion, devotion or eagerness of an occupation, activity, or pursuit in which such interest is shown
"It would be better to say that I'm enthusiastic than hardworking."

"enthusiastic crowds filled the streets"

"Ryan was so enthusiastic about football"
by JayRok October 4, 2009
having or showing intense and eager enjoyment, interest, or approval.
Also, Cinderpaw is much to enthusiastic about the the Thunderpath now.
by Swiftpaw❤️️Brightheart December 10, 2016
Excited and happy about everything going on. To feel very joyful.
Are u enthusiastical today?
by Fredrick Bobert May 20, 2008
In which you are enthusiastic In the fullest power
Enthusiasticness is full of energy
by yooomk3 December 16, 2018
A word used when in a bad mood at work to show frustration.
Dang it bob, arn't you so enthusiastic about all the cleaning?
by Richard (Rick) June 21, 2006