The effect a trapeze artist has on an audience is an example of astonish.
Origin of astonishaltered from Middle English astonien from Old French estoner from Vulgar Latin an unverified form extonare (for Classical Latin attonare) from ex-, intensive + tonare, to thunder
transitive verbas·ton·ished, as·ton·ish·ing, as·ton·ish·es
Origin of astonishAlteration of Middle English astonen from Old French estoner from Vulgar Latin extonāre Latin ex- ex- Latin tonāre to thunder ; see (s)tenə- in Indo-European roots.
(third-person singular simple present astonishes, present participle astonishing, simple past and past participle astonished)
From an alteration (due to words ending in -ish: abolish, banish, cherish, establish, furnish, etc.) of earlier astony, astone, aston, astun (“to astonish, confound, stun”), from Middle English astonien, astunien, astonen, astunen, astounen (“to astound, stun, astonish”), from Old English *āstunian, from ā- (perfective prefix) + stunian (“to make a loud sound, crash, resound, roar, bang, dash, impinge, knock, confound, astonish, stupefy”), from Proto-Germanic *stunōną (“to sound, crash, bang, groan”), from Proto-Indo-European *(s)ten-, *(s)ton- (“to thunder, roar, groan”), equivalent to a- + stun. Compare German erstaunen (“to astonish, amaze”). Influenced by Old French estoner, estuner, estonner (“to stun”), either from an assumed Latin *extonare, or from Old Frankish *stunen (“to stun”), related to Middle High German stunen (“to knock, strike, stun”) and thus also to the Old English word above.