Picture civilized as people who have agreed how to live together: small agreements about how you treat the person next to you, and large ones like law, government and schools. Uncivilized is the un- of that picture — standing outside the agreement. Zoom the camera in and it is one person ignoring the rules of the room. Zoom it out and it is a whole society described, from outside, as having none of those systems at all.
From the word’s history
Wiktionary gives the word as un- + civilized, so it is built as the plain negative of the civilized picture; the prefix adds nothing else.
Wiktionary 記的來源就是 un- + civilized。所以這個字是 civilized 的直接反面，前綴沒有另外加進別的意思。
Wiktionary entry 'uncivilized' (packet source_ref kaikki:3f6f69a190036ae4:745653973): 'From un- + civilized.'
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