IPA: /ʌnˈʃrʌŋk/
KK: /ʌnˈʃrʌŋk/
Not reduced in size or volume; remaining in its original dimensions.
The fabric is unshrunk, so it will maintain its size after washing.
Unshrunk → It is formed from "un-" (meaning not) and "shrunk" (the past participle of "shrink", which comes from Old English "scrincan", meaning to contract or become smaller). The word "unshrunk" means not having contracted or become smaller.
Think of 'not' ('un-') having 'contracted' ('shrunk') — that's why unshrunk means something that has not shrunk.