perduring

dependable enduring lasting permanent reliable stable strong tenacious

abiding constant diuturnal fast firm fixed impervious long-continued perdurable persistent resistant sound stout substantial tough

ephemeral irresponsible temporary unreliable weak

fragile impermanent poorly made undependable unsturdy

durable enduring long-lasting perpetual stable

everlasting invariable perennial set

abiding changeless continual diurnal fixed for keeps forever forever and a day immutable imperishable in for the long haul indestructible perdurable persistent set in concrete set in stone steadfast unchanging unfading

temporary

changing

ephemeral