■ tired 疲れている
ex) I was really tired after the long trip.
長い旅行の後、私は疲れていた

tired: feeling a need to rest or sleep
ex) She's too tired to go out tonight.
今晩 彼女は出かけるには、疲れすぎていた

■ tiredness 　疲労
ex) I fell on the bed for tiredness.
疲労のため、ベッドに倒れ込んだ

tiredness: temporary loss of strength and energy resulting from hard physical or mental work
ex) He said that it was tiredness that led him to make the mistake.
彼がその間違えを犯したのは 疲労のためであったと 彼は言っていた

■ weary 疲労した、疲れた
ex) I need to rest my weary eyes.
疲れ目を 休めたい

weary: lacking strength, energy, or freshness because of a need for rest or sleep
ex) She was weary from years of housework.
彼女は 長年の家事に対し 疲労感を感じていた

■ be the worse for wear　　　疲れて、くたくたで
ex) She looks worse for wear as she left the office at 11 pm.
11時にオフィスを出たせいで、彼女はとても疲れて見える

the worse for wear: : in worse condition after doing or experiencing something.
ex) Everyone talked animatedly and nobody felt worse for wear.
皆が活気を持って 会話に参加し、誰も疲労感を感じていなかった

■ fatigue　　　疲れ
ex) I can't shake off this fatigue.
疲れがとれない

fatigue: the state of being very tired : extreme weariness
ex) We were overcome by fatigue after the long journey.
長い旅行の後、私たちは疲労感に打ちひしがれていた<.p>

■ be frazzled 　　　　　　　　　（精神的に）疲れる
ex)　I've been frazzled for these last couple of days.
この２、３日、精神的に疲れている

frazzle: cause to show the effects of exhaustion or strain
ex) He was frequently frazzled by the conflicting demands of work and home.
彼は 仕事と家庭の 相反する要求に しばし 疲れを感じていた

■ feel sluggish 　　だるい
ex) After changing the job, I feel more productive and less sluggish.
転職の後、より生産的で、疲れを感じなくなった

sluggish: lacking energy or alertness
ex) A heavy lunch makes me sluggish in the afternoon.
昼食でたくさん食べ 午後は疲労感を感じていた

■ be beat 　　　　　　疲れる
ex) What a long day! I'm beat.
忙しい1日で疲れた

be beat: completely exhausted