inadvertently
adverb
ˌɪnədˈvɜːtəntli 
ˌɪnədˈvɜːrtəntli by accident; without intending to
Synonym
unintentionallyWe had inadvertently left without paying the bill.inadvertent ˌɪnədˈvɜːtənt ˌɪnədˈvɜːrtənt 
Definition of inadvertently adverb from the Oxford Advanced Learner's Dictionary
ˌɪnədˈvɜːtəntli ˌɪnədˈvɜːrtəntli ˌɪnədˈvɜːtənt ˌɪnədˈvɜːrtənt 