How did you stumble on Dearness?

Started running through the entire dictionary in batches of 500 words to see if each batch of 500 triggered the behavior, then binary search within the batch to find the problem word(s). Got bored partway through D.

Edit: Got unbored. Discovered that "Firstly", "Secondly", "Thirdly", and "Fourthly" trigger the bug, but "Fifthly" and above do not.

Edit 2: The first word can actually be any of the "problem" words -- "Also. And. And. And. And." also has the issue.

Upvote for unbored. And a perfect illustration for HN xD

That sounds about right for HN, well done.