No problemo with any of these, as far as I am concerned.

I thought you were meant to be a native speaker, meep/barn/taug/oviyst/gay whatever you like to call yourself, so why are you asking?

Not sure about coincidentally, the others seem OK.

Is this a quiz directed to non-native speakers or are you seeking reassurance from native speakers? And what is your answer to the question? You must have one, after all, you claim to be a native speaker (Southern Wisconsin American, IIRC).

well, coincidentally and inadvertently are more or less the same, aren't they?

However coincidentally is probably more colloquial and less "juridical".

No quiz, and yes I'm a native speaker, but I don't claim to know everything about the English language! @Dragon -- good memory ... it's Southern Wisconsin American -- btw, what's IIRC?

ON topic.

I had the conversation with a friend today, and I though all 4 above (in OP) were okay. We went through the nuances of the modifiers (coincidentally, accidentally, inadvertently, and indirectly), and I said:

They are all fine! (Which I still think.)

The other person said: coincidentally caused is not logically possible.

I left it at that and wanted to know what people on Leo thought.

Thanks for input. It sounds like maybe I'm wrong.

coincidentally and inadvertently are more or less the same, aren't they
Not to me, no. And not to LEO either:

Dictionary: coincidentally

Dictionary: inadvertently

Edit: Didn't you start a thread recently asking about the various abbreviations used in chats? IIRC must have been among them. It means "if i remember correctly".

@Dragon, our posts crossed. Thanks for posting that (the links). I'm torn sometimes between the difference of the 4 modifiers. That helps for others to understand this discussion.

Oui, 'twas me! IIRC was not among them (in my list)! (It should have been.) Thanks
(Posts crossed again.)