first-class

一流の;最高級の;すばらしい

first-class の類語

first-rate, splendid, excellent, superior, most, highest, famous, supreme, tops, first rate, best, capital, prime, greatest, top notch, topmost, utmost, optimum, tip top, top, fine, good, important, grand, maximal, rare, fantabulous, maximum, superlative, outstanding, select, uppermost, stunning, sovereign, elect, terrific, quality, topping, admirable, dandy, number one, sterling, banner, neat, gifted, swell, topflight

first-class の反意語

inferior, worst

first-class の言い換えを探すには

first-class（一流の）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。