The definition of permanent is someone or something that is supposed to last for a very long time.
Something that will last for only a limited period of time; transitory. Temporary is meaningless with regard to the duration of the length of time that it will last; however, it is used to designate absence of permanence.
The definition of tenuous is something long and thin, fine or flimsy.
Living or lasting only a short time; ephemeral.
continuing through life
Continuing for a lifetime; lifelong.
The definition of enduring is something that is long-lasting and patient.
Find another word for lifelong. In this page you can discover 11 synonyms, antonyms, idiomatic expressions, and related words for lifelong, like: permanent, livelong, temporary, tenuous, short-lived, womb-to-tomb, life-long, foster, lifetime, enduring and ephemeral.