enduringly
Definitions
In a manner that lasts for a long time; persistently.
In a way that remains firm, stable, or capable of withstanding hardship.
Examples
The classic novel remains enduringly popular with readers of all generations.
Their friendship was built on a foundation of trust that proved to be enduringly strong.
Synonyms
permanently lastingly persistently eternally constantly durably steadfastly
Antonyms
briefly temporarily transiently fleetingly momentarily ephemerally short-lived