Liar.
Unreliable
A person who has never died is called "alive."
Never Make a Promise was created on 1997-07-28.
An incorrect promise is saying something like: I promise to never fail
"A mailbox" fits. I don't know if it's what the person who invented the riddle had in mind or not.
A person who is never happy can be called a malcontent.
Some songs that include PROMISE in the title are "(I Never Promised You A) Rose Garden", "The Promise You Made" and "The Promise".
A promise
a promise
A promise
promise has never
No, he never really made a promise anyway
Sometimes a person that never gives up is called a bulldog!