Stun"ning (?), a.
1.
Overpowering consciousness; overpowering the senses; especially, overpowering the sense of hearing; confounding with noise.
2.
Striking or overpowering with astonishment, especially on account of excellence; as, stunning poetry.
[Slang]
C. Kingsley. --
Stun"ning*ly, adv. [Slang]
© Webster 1913.