IPA: //ˌæb.səntˈmaɪn.dɪd.li//
KK: /ˈæbsəntˈmaɪndɪdli/
In a way that shows a lack of attention or focus, often forgetting things or being unaware of what is happening.
She absentmindedly left her keys on the kitchen counter.
Absentmindedly → It is formed from "absent" (from Latin "absens", meaning not present) and "mindedly" (from "mind" which comes from Old English "gemynd", meaning memory or thought, combined with the adverbial suffix "-ly"). The word describes a state of being not present in thought or attention, often due to distraction.
Think of being 'not present' ('absent') in your thoughts ('mindedly') — that's why absentmindedly means acting without paying attention.
No commonly confused words.