Synonyms of the word

incidentally

• adv. (manner) In an incidental manner; not of central or critical importance.
• adv. By chance; in an unplanned way.
• adv. (speech act, conjunctive) Parenthetically, by the way.

accidentally

• adv. In an accidental manner; unexpectedly; by chance; casually; fortuitously.
• adv. Unintentionally.

apropos

• adj. Of an appropriate or pertinent nature.
• adj. by the way, incidental.
• prep. Regarding or concerning.
• adv. By the way.
• adv. Timely; at a good time.