IPA: /ʌnˈbɔɪld/
KK: /ʌnˈbɔɪld/
Not having been cooked in boiling water or heated to a high temperature.
The recipe calls for unboiled pasta to be added to the sauce.
Unboiled → It is formed from "un-" (meaning not) and "boiled" (from Old English "bylgian", meaning to bubble or seethe). The word "unboiled" means not having been subjected to the boiling process.
Think of 'not' ('un-') having gone through the 'bubbling' process ('boiled') — that's why unboiled means something that hasn't been boiled.