Tā duì zhè fèn gōngzuò jiànjiàn chǎnshēng le juàndàigǎn.
She has gradually developed a sense of burnout toward this job.
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倦怠 is more literary than 累 (lèi, 'tired') and carries a sense of deeper, sustained fatigue — physical exhaustion plus loss of motivation. The compound 职业倦怠 (zhíyè juàndài) is the standard Chinese translation of 'burnout' in psychology.
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倦 'weary' + 怠 'slack/lazy' — when you're so tired your effort itself goes slack.
