a. 不老实的, 不诚实的, 狡猾的

[ adj ]
not straightforward or candid; giving a false appearance of frankness
<adj.all>
an ambitious, disingenuous, philistine, and hypocritical operator, who...exemplified...the most disagreeable traits of his timea disingenuous excuse

Disingenuous \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. --Macaulay.