IPA: /ʌnˈtaɪəd/
KK: /ʌnˈtaɪərd/
Not feeling tired; having energy and not needing rest.
After a good night's sleep, I felt untired and ready to start the day.
Untired → It is formed from "un-" (meaning not) and "tired" (from Old English "tēorian", meaning to be weary or fatigued). The word "untired" means not weary or fatigued.
Think of 'not' ('un-') being added to 'tired' — this helps you remember that 'untired' means someone who is not feeling weary.