open and genuine; not deceitful
"he was a good man, decent and sincere"
"felt sincere regret that they were leaving"
"sincere friendship"
Genuine; meaning what one says or does; heartfelt.
"Her sincere apology touched everyone in the room because she truly meant every word she spoke."
In plain English: Sincere means being honest and genuine about what you feel without trying to pretend or trick anyone.
"She gave him a sincere apology for being late to their meeting."
Usage: Use sincere to describe genuine feelings or intentions, but avoid pairing it with inanimate objects like a sincere apology unless referring to the speaker's attitude. Do not confuse this adjective with "sincere" as a noun; there is no such word.
A male given name
"Sincer was named Sincere after his grandfather, who always believed in honesty above all else."
The word sincere comes from Middle French and originally meant "genuine" in Latin. Its roots trace back to ancient concepts of things growing together, rather than being made without wax as people once mistakenly believed.