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irrebuttable

[ir-i-buht-uh-buhl]

adjective

not rebuttable; incapable of being rebutted or refuted.

Origin:
1825–35; ir-² + rebuttable

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Irrebuttable has a plethora of syllables.

So is sesquipedalianism. Does it mean:

given to using long words.

an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.

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