01 a. Not being in truth what one appears to be; not sincere; dissembling; hypocritical; disingenuous; deceitful; false; -- said of persons; also…
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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 declarations.
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2.
Disappointing; imperfect; unsound.[Obs.]“To render sleep's soft blessings insincere.” — Pope.