groundlessly

He does not labour under any sense of personal injury, such as Iago felt in believing, however groundlessly, Othello: i. iii.

Spoken of them who groundlessly pretend kindred to great persons.

Some of them go so far as groundlessly to impute sheer hypocrisy to Racine.

The Austrian police suspected him, quite groundlessly, of intrigues with the Carbonari.

But all this reasoning is founded in an erroneous, and groundlessly degrading, opinion of human nature.