adverb
for a long time; for ages
Adverbial form of 久しい, used to describe a state or action continuing over a long period. Often used in written or slightly formal contexts.
See also: 久しい
彼には久しく会っていない。
I haven't seen him for a long time.
この町も久しく変わっていない。
This town hasn't changed for ages either.