assiduous

His assiduous reporting and his smart, passionate commentary have impressed colleagues and readers alike.

She soon gave birth to a daughter, her only child, whom she nurtured with the most assiduous care.

He was not seen again, at least in the flesh, but he became one of the most assiduous frequenters of De Quincey's visions.

Nobody is a greater slave than an assiduous courtier, unless it be a courtier who is more assiduous.

Only by an assiduous devotion to the contents of the daily newspapers in their reports of the doings of the socially elect.

She had been an assiduous student of the eighteenth century philosophers, and on the whole was a lady of considerable culture.