well-founded

事実に基づいた,根拠の確かな

well-founded の類語

well-set, reasonable, logical, sensible, well-grounded, sound, well-made, just, sure, well-built, fast, legal, strong, established, firm, solid, massive, confirmed, stable, consistent, settled, surefire, impressed, substantial, steady, reliable, old line, sane, long established, tenable, rooted, credible, predictable, durable, good, set, hard, heavy, engraved, trustworthy, vested, sturdy, tough, implanted, dyed-in-the-wool, etched, dependable, secure, staunch, ingrained, deep rooted, valid, embossed, sufficient, imprinted, legitimate, binding, lasting, faithful, rational

well-founded の反意語

unreasonable, silence, illogical, insensible, undependable

well-founded の言い換えを探すには

well-founded（事実に基づいた）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。