surprising (adj.)

• abrupt
• amazing
• astonishing
• astounding
• breathtaking
• confounding
• electrifying
• hasty
• headlong
• impetuous
• impulsive
• jarring
• jolting
• mind-boggling
• miraculous
• overwhelming
• precipitant
• precipitate
• precipitous
• prodigious
• quick
• shocking
• spectacular
• speedy
• staggering
• startling
• stunning
• stupendous
• sudden
• swift
• unanticipated
• unexpected
• unforeseen
• unlooked-for
• unpredicted
• wondrous