1) Abiding 2) Ageless 3) Certain 4) Durable 5) Eternal 6) Immortal 7) Imperishable 8) Lasting 9) Patient 10) Permanent 11) Remaining 12) Residual 13) Resilient 14) Rugged 15) Unending 1) Abiding 2) All-time 3) Constant 4) Eternal 5) Everlasting 6) For the ages 7) Immortal 8) Imperishable 9) Indestructible 10) Lasting 11) Lifetime 12) Long-lasting 13) Long-suffering 14) Never-ending 15) Patient 16) Permanent 17) Perpetual 18) Remaining 19) Serene 20) Stable 21) Standing 22) Standing the gaff 
• (a.) Lasting; durable; long-suffering; as, an enduring disposition. • (p. pr. & vb. n.) of Endure
En·dur'ing adjective Lasting; durable; long-suffering; as, an enduring disposition. 'A better and enduring substance.' Hebrew x. 34. -- 
lasting 
[adj] - patiently enduring continual wrongs or trouble
long-suffering adjective patiently enduring continual wrongs or trouble; `an enduring disposition`; `a long-suffering and uncomplaining wife`
lasting; permanent: a poet of enduring greatness. · patient; long-suffering.
unceasing[Intelligent words] unceasing