Similar word to showboat:
alarm, appall, astonish, blow away, cow, daunt, dazzle, flabbergast, frighten, grandstand, horrify, hotdog, impress, intimidate, knock socks off, overawe, scare, showboat, startle, strike, stun, stupefy, terrify
alarm, appall, astonish, blow away, cow, daunt, dazzle, flabbergast, frighten, grandstand, horrify, hotdog, impress, intimidate, knock socks off, overawe, scare, showboat, startle, strike, stun, stupefy, terrify