ind.
Analysis. yoniso (from yoni, 'source, origin' + -so, adverbial suffix) + eva ('indeed, quite'), literally 'according to the source indeed'; the compound emphasizes discernment rooted in first principles rather than blind repetition.
Etymology. yoni from √yuj (to join, yoke) via the sense 'that which joins or connects', hence 'source, womb, origin'—cognate with English yoke, Sanskrit yoga, Latin iugum. The adverbial -so derives from the demonstrative sa- (that one), making yoniso 'in that manner, from that source'. eva is an emphatic particle (cognate with Latin ipse via *epi-).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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