Of fire, light, etc.: inextinguishable. Frequently figurative and in figurative contexts.

= inextinguishable, adj.

(un-, prefix1 affix 1b.)

Of an abstract or immaterial thing: firmly established or settled; not liable to be destroyed or overthrown.

That cannot be extinguished (in various senses of the verb); unquenchable, indestructible, etc.

= indelible, adj.

Not perishable; esp. not subject to significant deterioration or loss of quality over time; = non-perishable, adj.

That cannot or must not be broken; indestructible; inviolable; irresistible. Now rare.

Incapable of being consumed.

Unquenchable.

(un-, prefix1 affix 1b.)

That cannot or may not be broken down or demolished.

That cannot be suppressed; incapable of suppression; irrepressible.

That cannot be razed or erased.

= inextinguishable, adj. Of feelings, qualities, actions, etc.

That cannot be lost, eradicated, or destroyed; indestructible, imperishable.

Incapable of being disintegrated, destroyed, or abolished; = indissoluble, adj. 1.

That cannot be destroyed; incapable of destruction. Used substantively: an indestructible thing.

(un-, prefix1 affix 1b.)

(un-, prefix1 affix 1.)

(un-, prefix1 affix 1b.)

Incapable of being obliterated.

(un-, prefix1 affix 1b.)