deceive.

Un sometimes occasi as ambiguity: thus undeceivable, undeceiving, undeceived, are either derivatives of the negative verb undeceive, or negatives of the simple word deceive.

The Scholar's Spelling Assistant; Wherein the Words Are Arranged on an Improved Plan, According to Their Respective Principles of Accentuation. In a Manner Calculated to Familiarize the Art of Spelling and Pronunciation, to Remove Difficulties, and to Facilitate General Improvement Intended for the Use of Schools and Private Tuition 1861

First, the dragon must not appear in his true character as antichristian; he must be clothed in some different attire in order to "deceive."

The Revelation Explained 1913

John Milton [the junior reporter] for not being able to tell him how to spell 'deceive.'

Journalism for Women A Practical Guide Arnold Bennett 1899