for certain

違いない

for certain の類語

certainly, surely, for sure, definitely, sure, absolutely, clearly, truly, indeed, of course, by all means, sure enough, at any rate, positively, sure as shooting, distinctly, decidedly, assuredly, forsooth, doubtless

for certain の反意語

unsure, by no means

for certain の言い換えを探すには

for certain（違いない）の類語・言い換え（パラフレーズ）を、日本語訳つきで関連度順に並べています。英作文の語彙を増やしたいとき、長文読解で本文と選択肢の言い換えを見抜きたいときに使えます。