Learn English – word for “without any reason” but a more formal one

formalityregistersingle-word-requests

A sample sentence would be:

Why did you ban me without providing a reason?

Is there a single word to replace "without providing a reason" with? Indiscriminately is not an option for me.

Best Answer

Unjustifiably comes to mind: a reason is needed to justify an action. Or possibly perversely. Or unreasonably.

unjustifiable : Not able to be shown to be right or reasonable

perverse : Showing a deliberate and obstinate desire to behave in a way that is unreasonable or unacceptable

unreasonable : Not guided by or based on good sense

Oxford Dictionaries Online

However, without providing a reason doesn't mean that there isn't one and the ban cannot be justified.

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