doozy
adjective
1. (slang, dated) Of high quality; remarkable; excellent. [1903]
2. (slang, US, archaic) Sporty, ostentatious, flashy. [1911]
noun
1. (US) something that is extraordinary. Often used in the context of troublesome, difficult or problematic, but can be used positively as well.
- Most of the test was easy, but the last question was a doozy.