Clean, with nothing extra added. A life with sex kept out of it, a kiss with no second meaning, a dress with no pattern — in each case something has been deliberately left out, and the word treats that as a good thing rather than a lack.
From the word’s history
Wiktionary traces chaste from Middle English chaste, from Old French chaste ('morally pure'), from Latin castus ('pure'). The old root is about being clean, which is why the modern word stretches from how a person lives to how a dress looks.
Wiktionary 記 chaste 來自中古英語 chaste、古法文 chaste（道德上純淨），再往前是拉丁文 castus（純淨）。字根講的是「乾淨」，所以它今天既能講一個人的生活，也能講一件衣服的樣子。
Wiktionary extract supplied in packet, source_ref kaikki:3f6f69a190036ae4:505570199, etymology_text "From Middle English chaste, from Old French chaste (morally pure), from Latin castus (pure)."
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