= inextinguishable, adj.

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

Continually exercised, constant, assiduous.

Of actions: Unremitting, persistent, constant.

Of qualities, actions, conditions, etc.: Marked by absence of abatement; unremitting.

Incapable of being or becoming wearied or tired; indefatigable, unremitting. Of qualities, conditions, or actions.

Of actions: = assiduous, adj. 3.

Unextinguished.

Unmitigated, unmoderated, unabated; unrelenting.

Not extinguished: still burning; unextinguished.

Not relaxed; (in early use) (Scottish) not free from restraint, legal process, or penalty; (now esp.) not free from tension or stress.