Of fire, light, etc.: not extinguished. Frequently figurative and in figurative contexts.

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

Unextinguished.

Unquenchable.

That cannot be quenched or extinguished; unquenchable, inextinguishable.

Not extinguished, quenched, or put out. Of fire or light (also figurative).

Not extinguished: still burning; unextinguished.