IPA: //ʌnˈsteɪd//
KK: /ʌnˈsteɪd/
Not supported or held in place; lacking stability or firmness.
The structure was left unstayed, making it vulnerable to strong winds.
Unstayed → It is formed from "un-" (meaning not) and "stayed" (from Old English "stǣgan", meaning to rise or to stay). The word "unstayed" means not held in place or not supported.
Think of something that is 'not' ('un-') 'held in place' ('stayed') — that's why unstayed means it is not supported.