insincerity

UK: /ˌɪnsɪnˈsɛrɪti/ US: /ˌɪnsɪnˈsɛrɪti/ ,(in′sin ser′i tē)

Inflections of 'insincerity' (n): npl: insincerities

WordReference Random House Unabridged Dictionary of American English © 2025

in•sin•cer•i•ty  (in′sin ser′i tē), n., pl. -ties for 2.

1. the quality of being insincere;
   lack of sincerity;
   hypocrisy;
   deceitfulness.
2. an instance of being insincere:
   He recalled their many past insincerities.

• in-³ + sincerity 1540–50

WordReference Random House Learner's Dictionary of American English © 2025

in•sin•cere /ˌɪnsɪnˈsɪr/   adj. 

1. not sincere; hypocritical:
   an insincere apology.

in•sin•cere•ly, adv. 
in•sin•cer•i•ty /ˌɪnsɪnˈsɛrɪti/  n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2025

in•sin•cere  (in′sin sēr′), adj. 

1. not sincere;
   not honest in the expression of actual feeling;
   hypocritical.

• Latin insincērus tainted, dishonest; see in-³, sincere
• 1625–35

in′sin•cere′ly, adv. 
Synonyms

deceitful, disingenuous, guileful, two-faced.