Definition of lengthy adjective from the Oxford Advanced American Dictionary

 

lengthy

 adjective
adjective
NAmE//ˈlɛŋkθi//
 
, NAmE//ˈlɛŋθi//
 
(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 verb
See the Oxford Advanced Learner's Dictionary entry: lengthy