diligence in one's work; work attitude; conduct on the job
Refers to the manner in which one performs one's duties, often implying diligence, conscientiousness, or the way one carries out work responsibilities. Somewhat formal and not an everyday word; more common in business or evaluative contexts.
His work attitude is always serious.
The boss evaluates the subordinates' conduct on the job.
Compound of 勤め (つとめ, 'duty, service, work') and 振り (ぶり, 'manner, style'). The exact historical derivation is uncertain, but the word follows a common pattern for describing the way an action is performed.