徹底
解説 Definition
物事を隅々まで注意深く完全にやり遂げる性質。綿密さ、徹底ぶり。
Thoroughness is the quality of doing something very carefully and completely. It means giving attention to all the important details so nothing is missed. This word is often used when talking about work, study, checking, or preparation.
覚え方のコツ Memory Tip
thoroughness は形で覚えると残りやすい語です。thorough「徹底した」に -ness が付いて「徹底していること」。kind→kindness と同じ定番パターンなので、見た瞬間に名詞だと判断できます。意味は単なる careful より強く、「一応やる」ではなく、抜け漏れなく最後まで詰める感じ。accuracy が正確さ、precision が精密さなら、thoroughness は範囲の広さも含めた綿密さ。仕事・調査・確認の丁寧さを評価する場面で結び付けて覚えると定着しやすいです。
Start with `thorough`, then add `-ness`, just like `kind` to `kindness`. That ending tells you it is a noun: the quality of being thorough. Remember it as more than just being careful: it suggests checking everything fully, with no gaps left.
例文
The detective was known for the thoroughness of her investigations.
その刑事は捜査の徹底ぶりで知られていた。
We were impressed by the thoroughness of the audit report.
監査報告書の綿密さに私たちは感心した。
His thoroughness in preparing for exams always resulted in top grades.
試験準備における彼の徹底ぶりは、常にトップの成績につながった。
thoroughness の類義語・関連語
thoroughness の語源・成り立ち Etymology
thoroughness は thorough「徹底した」+ 接尾辞 -ness「性質」。thorough は古英語 þurh/thurh「通り抜けて、すみずみまで」由来で、「端から端まで通る」感覚が「徹底」になった。関連語は through, thoroughfare。
Thoroughness is formed from thorough and the noun suffix -ness. Thorough comes from Old English thurh, meaning "through" or "from end to end," and the idea later became "complete" or "careful in every part." That is why thoroughness suggests doing something fully and leaving nothing out; compare through and thoroughfare.
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