IPA: /ˌɪnədˈvɜːtənt/
KK: /ˌɪnədˈvɜrtənt/
Describing something that happens by accident or without intention, often due to a lack of attention or care.
His inadvertent mistake caused a delay in the project.
Inadvertent → It is formed from "in-" (meaning not) and "advertent" (from Latin "advertentem", the present participle of "advertere", meaning to turn towards). The word "inadvertent" describes actions that are not turned towards or considered, hence unintentional or accidental.
Think of 'not' ('in-') paying attention or 'turning towards' ('advertent') something — that's why inadvertent means unintentional.