at random

無作為に；手当たり次第に；でたらめに

入試の言い換え

• randomly 無作為に — 1語の定番言い換え
• arbitrarily 恣意的に — 根拠なく勝手に。硬い
• haphazardly 行き当たりばったりに — 計画性がない
• by chance 偶然に — 運任せの意味で
• without any order 順序なしに — 説明的
• indiscriminately 無差別に — 見境なく。否定的

科学系長文の実験では participants were randomly assigned（参加者は無作為に割り当てられた）が頻出。偏りのない公平な実験であることを示す重要な表現。

at random の類語

randomly, arbitrarily, haphazardly, by chance, without any order, indiscriminately, off and on, every which way, roughly, irregularly, random, intermittently, sporadically, unevenly, hit or miss, willy-nilly, variably, around, about, in spots, by fits, fitfully, haltingly, by catches, spasmodically, any which way, jerkily, carelessly, at irregular intervals, erratically, by jerks, casually, in snatches, anyhow, at intervals, aimlessly, haphazard, unpredictably, at haphazard, by snatches, uncertainly, sloppily, whimsically, capriciously, unsteadily, eccentrically, at hazard, promiscuously, discontinuously, brokenly, inexplicably, desultorily, patchily, unsystematically, helter-skelter, unaccountably, stochastically, anywise, purposelessly

at random の反意語

systematically, in order, deliberately, regularly

at random の言い換えを探すには

at random（無作為に）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。入試で狙われる言い換えパターン、ニュアンスの違い、語源、日本人がやりがちなワナも解説。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。