/ ˌɪnədˈvɜːtəntli; NAmE -ˈvɜːrt-/ adverb
by accident; without intending to
SYN unintentionally :
We had inadvertently left without paying the bill.
► in·ad·vert·ent adjective :
an inadvertent omission
► in·ad·ver·tence noun [ U ]
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WORD ORIGIN
mid 17th cent. (earlier ( late Middle English ) as inadvertence ): from in- (I) not + Latin advertent- turning the mind to (from the verb advertere ) + -ly .