accidentally
/ˌæksəˈdɛnt(ə)li/
/ˌæksəˈdɛnt(ə)li/
adverb
-
In an accidental manner; by chance, unexpectedly.
"He discovered penicillin largely accidentally."
-
Unintentionally.
"He accidentally exposed the bacteria to mold spores."
Synonyms:
casually, fortuitously
Antonyms:
advisedly, by choice, by design, deliberately, designedly, intentionally, on purpose, purposely