Favorite Uncommonly Used Words?

Regardless and Irregardless are both words, much in the same way that flammable and inflammable are both words. Their prefix denotes they should be the opposite of the previous word, but the word means the same as its root.

My additions to the list -

Monosyllabic (a multi-syllable word which means one syllable)
Nebbish
 
bread's done
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