adjective
showing great care, attention, and effort; diligent
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The assiduous student always completed her assignments on time and with great attention to detail.
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My assiduous coworker never misses a deadline and always puts in extra effort to get the job done right.
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I admire how assiduous my friend is when it comes to studying for exams; she really puts in the work.
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The artist's assiduous brush strokes brought the painting to life, capturing every detail with precision.