Definify.com
Webster 1913 Edition
Insincere
1.
Not being in truth what one appears to be; not sincere; dissembling; hypocritical; disingenuous; deceitful; false; – said of persons; also of speech, thought; etc.;
as,
. insincere
declarations2.
Disappointing; imperfect; unsound.
[Obs.]
Syn. – Dissembling; hollow; hypocritical; deceptive deceitful; false; disingenuous; untrustworthy.
Webster 1828 Edition
Insincere
INSINCE'RE
,Adj.
1.
Not sincere; not being in truth what one appears to be; dissembling; hypocritical; false; used of persons; as an insincere heart.2.
Deceitful; hypocritical; false; used of things; as insincere declarations or professions.3.
Not sound.