einstein
n. countable B2 Upper Intermediate US //ˈaɪnstaɪn// ein·stein
n. a person who is extremely smart. You can also use it as a joke to describe someone who has just done something silly.
n. an exceptionally intelligent person; a genius. Often used ironically in informal speech to mock someone who has made an obvious mistake or stated something self-evident.
You don't need to be an Einstein to solve this puzzle.
Nice job locking your keys in the car, Einstein.
While the team lacked a singular Einstein to lead the research, their collective expertise allowed them to solve the complex physics equations ahead of schedule.
Borrowed from German Einstein. * The common noun is an eponym of Albert Einstein.
Usage
Used as a common noun to describe a type of person rather than the historical figure.