insincerity
UK: ˌɪnsɪnˈsɛrɪti | US: ˌɪnsɪnˈsɛrəti
n. the quality of not expressing genuine feelings; dishonesty or deceitfulness in speech or behavior
The word "insincerity" combines the negative prefix "in-" (from Latin, meaning "not") with "sincere" (from Latin sincerus, meaning "clean, pure, genuine") and the noun-forming suffix "-ity" (from Latin -itas). "Sincere" originally referred to something unadulterated or free from falseness. Over time, "insincerity" emerged to describe the absence of honesty or authenticity, reflecting a logical progression from its root components.
His insincerity was obvious when he gave a forced smile.
She detected a hint of insincerity in his overly polite tone.
The politician’s insincerity made voters distrust his promises.
Insincerity in relationships often leads to misunderstandings.
The apology lacked warmth and was full of insincerity.