IPA: /ˌɪnədˈvɜːrtəntli/
KK: /ˌɪnədˈvɜːrtəntli/
In a way that is not intentional; by accident or mistake.
She inadvertently sent the email to the wrong person.
Inadvertently → It is formed from "in-" (meaning not) and "advertent" (from Latin "advertentem", the present participle of "advertere", meaning to turn towards). The suffix "-ly" (meaning in a manner) indicates the manner of the action. Thus, "inadvertently" means in a manner that does not turn towards or consider something, implying an unintentional action.
Think of 'not turning towards' ('in-') something important, which helps you remember that 'inadvertently' means doing something unintentionally.