She hated questioning Liddy about her husband’s movements, and indeed had hitherto sedulously avoided doing so; but now all the house knew that there had been some dreadful disagreement between them, and it was futile to attempt disguise.
There are no more uses of "sedulous" in the book.
Show samples from other sources
The voice was overly ingratiating, sedulously sweet.
William Styron -- Sophie’s Choice
She wondered what sort of herbs they were which the old man was so sedulous to gather.