amateurishadj.
/ˈamətərɪʃ/, /ˈamətʃərɪʃ/, /ˌaməˈtəːrɪʃ/, U.S. /ˌæməˈtərɪʃ/, /ˌæməˈtʃərɪʃ/, /ˌæməˈt(j)ʊrɪʃ/, /ˌæməˈtʃʊrɪʃ/ Characteristic of an amateur; unskilful, inexpert.
ΘΚΠ
the world > action or operation > ability > inability > unskilfulness > [adjective] > unskilled in art or craft > not professional
unprofessional1770
amateur1814
unbusiness-like1824
amateurish1847
hackish1868
unbusiness1901
amateur night1910
amateur hour1925
do-it-yourself1959
DIY1991
1847 Theatr. Times 11 Sept. 286/2 With the exception of Martin Heywood.., it was amateurish indeed.
1864 M. E. Braddon Henry Dunbar III. i. 6 Fond of pictures, in a frivolous amateurish kind of way.
1935 W. S. Churchill Let. 18 Jan. in W. S. Churchill & C. S. Churchill Speaking for Themselves (1999) xvi. 374 Randolph has no experience of electioneering and does not seem to want advice, and the whole thing is amateurish in the last degree.
2016 T. Osman Islamism (2017) viii. 185 Unlike any previous coup d'état in Turkey, it appears to have been quite amateurish in its execution.
This entry has been updated (OED Third Edition, June 2021; most recently modified version published online December 2021).
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adj.1847