なるほど (translations)→ actually admittedly ah aha certainly convinced do fine gotcha indeed magnificent probably quite really so sure then true truly uh-huh undoubtedly well yes
びっくりする (translations)→ panic remarkable shocked worried
意外な (translations)→ astonished expect extraordinary obvious odd unexpected
疑う (translations)→ believe distrust doubt guess know sus think wonder
仰天する (translations)→ amaze astonish freak horrify jump terrify
思いがけない (translations)→ abrupt accidental alarming curious disproportionately piece startle strange surprise unbelievable unheralded unsuspected
唐突に (translations)→ abruptly inconsequently soon suddenly
不思議 (translations)→ impressive marvel mysterious puzzle strangeness surprising
驚く (translations)→ appreciation die impress shock shock oneself startled
