on the level

on the level の類語

up-and-up, open and aboveboard, straight shooting, good-faith, square-shooting, straight-shooting, square dealing, square-dealing, aboveboard, on the square, foursquare, genuine, on the up-and-up, single-hearted, fair and square, bona fide, authentic, straight, veritable, open, square, honest, sincere, frank, even, level, transparent, honorable, ingenuous, artless

on the level の言い換えを探すには

on the level（）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。