American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
Otherwise they will be too abstruse or, worse, too dull for the reader to care about.— Ten Minutes, That's It
Abstruse has been looked up 1495 times, favorited 6 times, listed 97 times, and commented on twice.

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a year.
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