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неискренний adj. stresses
gen.	insincere; tortuous; devious; diplomatic; disingenuous; fulsome; hollow; lip; mealy; double-tongued; hollow-hearted; knick-knacky; lip-deep; uncandid; uncordial; unsincere; claptrap; crocodilian; sinuous; affected; showy; sinuated; left-handed; coloured; double tongued; hollow hearted; knick knacky; lip deep; underhanded; backhand; canting; counterfeit; fulsome apologies (bigmaxus); fulsome excuse (bigmaxus); deceitful (Lanita2); oblique (Bullfinch); inauthentic (SirReal); not authentic (SirReal); circuitous (VLZ_58); oleaginous (КГА); mealymouthed (Taras); ingenuine (rosulingua)
Игорь Миг	double-dealing
amer.	roguish (a roguish grin Val_Ships); mock (She gave a little ​scream in mock ​surprise when she ​opened the ​door and ​saw us. Val_Ships); glad-handing (insincere and false: glad-handing politician Taras)
dipl.	false
fig.	backhanded
Makarov.	bad; plastic; underhand
slang	hairy; hockey; mickey mouse; mickey-mouse; micky mouse; micky-mouse; slick; snide; hokey; gil-hooley
неискренне adj.
gen.	histrionically; lefthandedly; hollowly (NGGM); in bad faith (murad1993)
obs.	from the teeth forward; from the teeth forwards; from the teeth outward; from the teeth outwards
неискренно adv.
gen.	insincerely
Gruzovik	disingenuously

неискренний: 79 phrases in 12 subjects

American usage, not spelling	1
Australian	1
Business	1
Diplomacy	1
Explanatory translation	6
Figurative	1
General	33
Idiomatic	4
Informal	4
Makarov	11
Rude	1
Slang	15