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impermissible

[im-per-mis-uh-buh l] /ˌɪm pərˈmɪs ə bəl/
adjective
1.
not permissible or allowable; unallowable.
Origin of impermissible
1855-1860
First recorded in 1855-60; im-2 + permissible
Related forms
impermissibility, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for impermissible

impermissible

/ˌɪmpəˈmɪsɪbəl/
adjective
1.
not permissible; not allowed
Derived Forms
impermissibility, noun
impermissibly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for impermissible
adj.

1814, from assimilated form of in- "not, opposite of" (see in- (1)) + permissible.

Online Etymology Dictionary, © 2010 Douglas Harper
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