Definition of illegible adjective from the Oxford Advanced American Dictionary

 

illegible

 adjective
adjective
NAmE//ɪˈlɛdʒəbl//
 
(also unreadable)
 
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difficult or impossible to read an illegible signature opposite legible
illegiblyadverb
 
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NAmE//ɪˈlɛdʒəbli//
 
See the Oxford Advanced Learner's Dictionary entry: illegible