overenthusiastic (adj.)
- accident-prone
- bigoted
- breakneck
- careless
- delirious
- desperate
- devil-may-care
- extravagant
- extreme
- extremist
- fanatic
- fanatical
- febrile
- feverish
- frantic
- frenetic
- frenzied
- furious
- haggard
- harum-scarum
- hasty
- headlong
- hectic
- hotheaded
- hurried
- hysteric
- impetuous
- infatuated
- inordinate
- insane
- irrational
- mad
- overanxious
- overeager
- overzealous
- perfervid
- precipitant
- precipitate
- precipitous
- rabid
- reckless
- slapdash
- unreasonable
- wanton
- wild
- wild-eyed
