Synonyms for incidentally

Adverb

1. by the way, by the bye, incidentally

usage: introducing a different topic; "by the way, I won't go to the party"

2. incidentally, accidentally, by chance,incidental (vs. basic), incident

usage: in an incidental manner; "these magnificent achievements were only incidentally influenced by Oriental models"

3. apropos, incidentally

usage: by the way; "apropos, can you lend me some money for the weekend?"