Reverse Dictionary: INCIDENTAL

ADVERBS
► ACCIDENTARILY by way of accident; casually, incidentally → 1651 obs.
► ACCIDENTLY non-essentially, incidentally, as a secondary effect → 1506 obs.
► OBITANEOUSLY by the way, in passing → a1834 obs.
► OBITER by the way, in passing, incidentally → 1573
► OBITERLY by the way, in passing, incidentally → 1605 obs.

NOUNS
► BY-THE-WAY an incidental remark → 1896
► OBITER something said, done, or occurring by the way; an incidental matter → 1607 obs.