Definition of amateurish adjective from the Oxford Advanced American Dictionary

 

amateurish

 adjective
adjective
NAmE//ˌæməˈtʃʊrɪʃ//
 
, NAmE//‑ˈtərɪʃ//
 
, NAmE//‑ˈtʃərɪʃ//
 
(also amateur)(usually disapproving)
 
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not done or made well or with skill Detectives described the burglary as “crude and amateurish.” opposite professional
See the Oxford Advanced Learner's Dictionary entry: amateurish