疲れ知らずの
解説 Definition
疲れを知らず、休むことなく精力的に活動し続ける性質。飽くことなく努力を続ける姿勢を表す。
Tireless describes someone who keeps working hard and showing energy without seeming to get tired. It is often used as praise for strong effort, support, or dedication over a long time.
覚え方のコツ Memory Tip
tireless は、まず tired（疲れた）や tire（疲れさせる・疲れる）が浮かべば覚えやすい語です。そこに -less「〜がない」が付くので、「疲れがない→疲れ知らず」。同じ型の endless, harmless, fearless も一緒に見ると定着します。人の性格だけでなく tireless efforts（たゆまぬ努力）, tireless support のように、長く続く献身や粘り強さを表すのが典型。単に energetic というより、休まず続ける感じが強い語です。
Use the parts: `tire` + `-less`. If someone is tireless, they seem to have no tired feeling stopping them. It is easy to remember with other `-less` words like `endless`, `fearless`, and `harmless`, and with phrases such as `tireless efforts`.
例文
The tireless volunteers cleaned the park before sunrise.
疲れ知らずのボランティアたちは日の出前に公園を掃除しました。
Her tireless research led to a new vaccine.
彼女のたゆまぬ研究が新しいワクチンにつながった。
He was a tireless performer in every concert.
彼は毎回のコンサートで疲れを知らない演奏者だった。
tireless の類義語・関連語
tireless の語源・成り立ち Etymology
tirelessはtire「疲れさせる・疲れる」に、欠如を表す接尾辞-lessが付いた語です。tireは中英語を経て古フランス語tirer「引っぱる」と結び付ける説があり、力を引き出し尽くしてもなお尽きない感じが「疲れ知らず」に出ます。retireやattireは遠い親類です。
Tireless is built from tire and the suffix -less, meaning without. Tire in the sense of make weary is recorded in Middle English and is often linked to Old French tirer, meaning to pull or draw out. The idea suggests being worn out by effort, so tireless came to mean not becoming weary even after continued work. Attire and retire are distant relatives through the same French verb.
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