What is the meaning of Sincere?

Genuine; meaning what one says or does; heartfelt.

Meant truly or earnestly.

clean; pure

sincerely

feminine plural of sincero

uprightly, honestly, frankly, sincerely

vocative masculine singular of sincērus

sincere (genuinely meaning what one says or does)

inflection of sincerar:

1. first/third-person singular present subjunctive
2. third-person singular imperative

first/third-person singular present subjunctive

third-person singular imperative

Source: wiktionary.org