We have put together a list of words that are similar to ACCIDENTAL.

9 Alternative Words Similar to accidental

1 Inadvertent Adjective      Synonym Words Like Inadvertent
2 Adventitious Adjective      Synonym Words Like Adventitious
3 Casual Adjective      Synonym Words Like Casual
4 Chance Adjective      Synonym Words Like Chance
5 Extrinsic Adjective      Similar Words Like Extrinsic
6 Unintended Adjective      Similar Words Like Unintended
7 Unplanned Adjective      Similar Words Like Unplanned
8 Fortuitous Adjective      Synonym Words Like Fortuitous
9 Incidental Adjective      Synonym Words Like Incidental

4 examples of accidental

1 an accidental visit
2 are accidental to a play
3 accidental poisoning
4 an accidental shooting

10 definitions of accidental

1 Happening by chance, or unexpectedly; taking place not according to the usual course of things; casual; fortuitous.
2 Nonessential; not necessary belonging; incidental.
3 A property which is not essential; a nonessential; anything happening accidentally.
4 Those fortuitous effects produced by luminous rays falling on certain objects so that some parts stand forth in abnormal brightness and other parts are cast into a deep shadow.
5 A sharp, flat, or natural, occurring not at the commencement of a piece of music as the signature, but before a particular note.
6 happening by chance or unexpectedly or unintentionally
7 a musical notation that makes a note sharp or flat or natural although that is not part of the key signature
8 Occurring unexpectedly, unintentionally, or by chance.
9 Music Of or relating to an accidental.
10 A property, factor, or attribute that is not essential.
We get our data from many different dictionaries across the web:
Wordnik, Wiktionary, Century, American Heritage, Gcide