Dis·in·gen·u·ous a.
1. Not noble; unbecoming true honor or dignity; mean; unworthy; as, disingenuous conduct or schemes.
2. Not ingenuous; wanting in noble candor or frankness; not frank or open; uncandid; unworthily or meanly artful.
So disingenuous as not to confess them [faults]. --Pope.
-- Dis*in*gen*u*ous*ly, adv. --T. Warton. -- Dis*in*gen*u*ous*ness, n.
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disingenuousness
n : the quality of being disingenuous and lacking candor [ant: ingenuousness]