untruthful

From un- +‎ truthful. Compare Middle English untreuthfull, untrowþeful, wntreuthtfull (“unbelieving, infidel”).^[1]

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untruthful (comparative more untruthful, superlative most untruthful)

1. Not giving the truth; providing untrue facts; lying. [from circa 1820s]
   • 1827, [Henry Taylor], act III, scene V, in Isaac Comnenus. A Play., London: John Murray, […], →OCLC, page 134:

     Cousin, good night; / And whatsoe’er be told of me henceforth, / A most untruthful annalist were he, / Who said I did not love my cousin Anna.

   • 1832, chapter VI, in The Waning Church, London: […] James Nisbet, […], →OCLC, page 114:

     Upon principle it is his aim to exhibit integrity of dealing, honest and godly sincerity to all men; if he fail, it must be in degree, it cannot be in kind; for a false and untruthful mind can never rightly know God; the more we know of him, the more upright and ingenuous, and liberal, and kind, and humane, and generous, must be our conduct to man.

   • 1965, Ann Ree Colton, The soul and the ethic, page 167:

     He who obeys not the good Shepherd of the soul and heart has an untruthful mind; a mind filled with fallacies; a mind of wrong resolvings and concludings.

2. Pertaining to falsehood; corrupt; dishonest. [from circa 1820s]
   • 1828, Charles Thomson, Letter to the Rev. Henry Grey, on Certain Passages Contained in the Letters of Anglicanus, Edinburgh: […] William Whyte & Co. […] and sold by M[aurice] Ogle, and William Collins, […], →OCLC, page 4:

     But what was our astonishment when the “Seven Letters by Anglicanus” made their appearance amongst us, accompanied by the report that you—one of our brethren—was the author of that untruthful, bitter, and malignant publication!

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