ind
Analysis. a- (not) + yoni (source, origin, womb) + -so (instrumental adverb suffix); literally 'not according to the source', hence improper or irrational thinking that does not follow the proper basis of understanding.
Etymology. a- (not) + yoni (source, origin), from √yam 'to stretch, extend', the same root giving Sanskrit yoni and English words like 'genesis' through the Indo-European *geneǝ-; the instrumental -so turns the noun into an adverb meaning the manner or means by which something is done.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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