accidentally

adverbs

without advance planning
"they met accidentally"
accidentally, by chance, circumstantially, unexpectedly
antonym
deliberately
of a minor or subordinate nature
"these magnificent achievements were only incidentally influenced by Oriental models"
accidentally, incidentally
without intention; in an unintentional manner
"she hit him unintentionally"
accidentally, unintentionally
antonym
deliberately
is derived from
accidental