primitive
US /ˈprɪm.ə.t̬ɪv/
UK /ˈprɪm.ə.t̬ɪv/

1.
relating to, denoting, or preserving the character of an early stage in the evolutionary or historical development of something
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Early humans used primitive tools for hunting.
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The tribe lived in a primitive society.
2.
not developed or sophisticated; crude
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The computer graphics were quite primitive by today's standards.
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His understanding of the subject was very primitive.
1.
a person belonging to a preliterate, nonindustrial society or culture
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The anthropologist studied the customs of the primitives.
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Some art critics refer to certain self-taught artists as primitives.