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adverb

rigoureusement

/ʁi.ɡu.ʁøz.mɑ̃/

adverb/ʁi.ɡu.ʁøz.mɑ̃/

rigorously, strictly, thoroughly; absolutely, entirely

Nous n'en savons rigoureusement rien !We know absolutely nothing!

From rigoureux + -ment.