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Used to describe the way in which one laughs politely but not genuinely at something they do not find funny in the least
His comment was so unfunny I had to chuntle to make him feel like he had made a joke.
An incorrectly placed, unnecessary, or missing apostrophe.
Included in this are greengrocer's apostrophes, but any misused apostrophes can be classed as impostorphes, especially unneeded ones, and ones put in the wrong place.
The impostorphe in that sign reading "Do not feed the pig's" should be destroyed.