When they stood together at the rail and he chanted in his ludicrous up-and-down Swedish sing-song that it was a fine evening, she remarked, "Well, Mr. Roughneck, have you been up to something smart again today?
There are no more uses of "ludicrous" in the book.
Show samples from other sources
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.