of forget
out of one's mind
Cases of word usage
1) living for ever; never forgotten (immortal)
2) the state of being completely forgotten or having forgotten (oblivion)
3) to live longer than (another person); to live until (something) is forgotten (outlive)
4) to preserve (something) from being forgotten or from going out of use (perpetuate)
5) that cannot be forgotten (unforgettable)