IPA: //ʌnˈfjuːzd//
KK: /ʌnˈfjuzd/
Not combined or joined together; remaining separate or distinct.
The two metals remained unfused, allowing for better conductivity in the circuit.
Unfused → It is formed from "un-" (meaning not) and "fuse" (from Latin "fundere", meaning to pour). The word "unfused" means not poured together or not melted into a single mass.
Think of 'not' ('un-') being combined with 'pouring' ('fundere') to remember that 'unfused' means something that has not been melted or combined into one.