Example : Your ability to speak six languages amazes me!.

Synonyms : astonish, astound

Example : This beats me!.
Got me--I don't know the answer!.
A vexing problem.
This question really stuck me.

Synonyms : baffle, beat, bewilder, dumbfound, flummox, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy, vex