IPA: //ʌnˈmaɪndfəl//
KK: /ʌnˈmaɪndfəl/
Not paying attention or being careless about something.
She was unmindful of the time and missed her appointment.
Comparative: more unmindful
Superlative: most unmindful
Unmindful → It is formed from "un-" (meaning not) and "mindful" (from Old English "myndfull", meaning full of mind or aware). The word "unmindful" means not being aware or not paying attention.
Think of 'not' ('un-') being added to 'full of mind' ('mindful') — this helps you remember that 'unmindful' means not paying attention.