IPA: /ʌnˈdrʌŋk/
KK: /ʌnˈdrʌŋk/
Describing something that has not been consumed as a drink or has not caused intoxication.
After the party, I found an undrunk bottle of wine on the table.
Undrunk → It is formed from the prefix "un-" (meaning not) and the root "drunk" (the past participle of "drink", meaning to consume a liquid). The word "undrunk" means not having been consumed or not having drunk.
Think of 'not' ('un-') having 'consumed' ('drunk') a drink — that's why undrunk means not having drunk.