sincerity

UK: /sɪnˈsɛrəti/ US: /sɪnˈsɛrɪti/ ,(sin ser′i tē)

Inflections of 'sincerity' (n): npl: sincerities

WordReference Random House Unabridged Dictionary of American English © 2025

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

1. freedom from deceit, hypocrisy, or duplicity;
   probity in intention or in communicating;
   earnestness.

• Latin sincēritās. See sincere, -ity
• 1540–50

Synonyms

truth, candor, frankness. See honor. 

Antonyms

duplicity.

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

sin•cere /sɪnˈsɪr/   adj., -cer•er, -cer•est. 

1. not false or pretended:
   a sincere apology.
2. genuine; real:
   a sincere effort to improve.

sin•cere•ly, adv. 
sin•cer•i•ty /sɪnˈsɛrɪti/  n. 

[uncountable] dealing with his students with sincerity.

WordReference Random House Unabridged Dictionary of American English © 2025

sin•cere  (sin sēr′), adj., -cer•er, -cer•est. 

1. free of deceit, hypocrisy, or falseness;
   earnest:
   a sincere apology.
2. genuine;
   real:
   a sincere effort to improve; a sincere friend.
3. pure;
   unmixed;
   unadulterated.
4. [Obs.] sound;
   unimpaired.

• Latin sincērus pure, clean, untainted
• 1525–35

sin•cere′ly, adv. 
sin•cere′ness, n. 
Synonyms

• 1. frank, candid, honest, open, guileless; unaffected. See earnest ¹.

Antonyms

• 1, 2. false.