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Webster 1913 Edition

Adj.

Impostrous; deceitful.

Strictness fales and

impostrous

Beau. & Fl.

Adj.

Deceitful. [Not used.]

imposturous ‎(comparative more imposturous, superlative most imposturous)

(obsolete) deceitful
(Can we find and add a quotation of Beaumont and Fletcher to this entry?)