Definition of lengthy adjective from the Oxford Advanced Learner's Dictionary

 

lengthy

 adjective
adjective
BrE BrE//ˈleŋθi//
 
; NAmE NAmE//ˈleŋθi//
 
(lengthier, lengthiest)
 
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very long, and often too long, in time or size lengthy delays the lengthy process of obtaining a visa a lengthy explanationWord Familylong adjective adverblength nounlengthy adjectivelengthen verbExtra examples After a fairly lengthy delay, we were able to continue. Agreement was finally reached after very lengthy discussions. A court case will be expensive and lengthy. I had to go through the lengthy process of obtaining a visa. There is a lengthy summary of the discussions in his diary.
See the Oxford Advanced American Dictionary entry: lengthy