Synonyms for Stunning:

adj.

attractive (adjective)
ravishing.
beautiful (adjective)
gorgeous, handsome, exquisite, fair, sublime, finished, comely, graceful, pulchritudinous, resplendent, elegant, pleasing, ornamental, superb, angelic, beautiful, shapely, polished, refined, picturesque, quaint, pretty, bonny, attractive, lovely, good-looking, radiant, glorious, breathtaking, beauteous, dazzling, belle, flowerlike, splendid, glamorous, becoming, enchanting, eye-filling, charming, sightly.
beautiful, marvelous (adjective)
beauteous, handsome, lovely, sensational, pretty, impressive, ravishing, comely, gorgeous, dazzling, bonny, fair, remarkable.
noticeable (adjective)
eye-catching, arresting.
surprising (adjective)
unexpected, astonishing.

n.

delightful, appealing, nice-looking, eye-catching, adorable, captivating, beguiling. pulchritudinous, ravishing, extraordinary, phenomenal, earth-shattering, unexpected, beauteous, easy on the eyes. striking (noun)
remarkable, marvelous.
stunning (noun)
disorienting, sensational, surprising, arresting, beautiful, impressive.

v.

amazing (verb)
dazzling, Dazing, amazing, surprising, Impressing, astonishing, astounding, overwhelming, bewildering.
disabling (verb)
Dulling, Scotching, incapacitating, Cramping, Laming, Handicapping, disarming, undermining, Paralyzing, hindering, Impairing, tampering, Hampering, Abrogating, Benumbing, Hobbling, Sapping, Botching, Neutralizing, disabling, enfeebling, stupefying, Vitiating, invalidating, Hamstringing, weakening, crippling, deadening, Prostrating, anesthetizing, screwing up.

Other synonyms:

beauteous, pulchritudinous, adorable, captivating, nice-looking, delightful, eye-catching, unexpected, ravishing, beguiling. appealing. arresting
arresting.

Usage examples for stunning

  1. It was a stunning blow, and the man was certainly silenced. – The Boy Scout Aviators by George Durston
  2. Mrs Herbert gradually recovered from the stunning effect of an overpowering joy, and was able to inquire into the cause of his strange silence, and his sudden return. – Amy Herbert by Elizabeth Sewell
  3. But the balanced trap- door, resuming its equilibrium, caught me on the back of the head, half- stunning me, and in another second I would have gone down into the dark among the alligators. – Caves of Terror by Talbot Mundy