There passed through Morris Townsend’s mind a rapid wonder as to what he might, even under a remote contingency, be indebted to from the action of this principle in Dr. Sloper’s breast, and the inquiry exhausted itself in his sense of the ludicrous.
There are no more uses of "ludicrous" in the book.
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Though she was serious, her suggestion was so ludicrous, I couldn’t suppress a laugh.
In Zimbabwe inflation reached the ludicrous level of 231 million per cent.