adj.
VERBS
▪ be
▪ become
ADVERB
▪ extremely , fairly , very , etc.
▪ relatively
Prolonged is used with these nouns: ↑ absence , ↑ applause , ↑ battle , ↑ bout , ↑ conflict , ↑ drought , ↑ duration , ↑ exposure , ↑ illness , ↑ period , ↑ recession , ↑ siege , ↑ silence , ↑ slump , ↑ spell , ↑ starvation , ↑ stay , ↑ stopover , ↑ suffering , ↑ use