All etymological dictionaries includung Wiktionary and De Vaan’s Etymological Dictionary state the ultimate origin of the Latin adjective idoneus (‘suitable’; ‘sufficient’) is unknown.

I was wondering if anybody had a theory on the origin of this word; I would be glad if someone could shed light on this problem.

Also, De Vaan says:

The morphology can be interpreted as an adj. in -neus to *idō (‘there’?) or *ido-, or as an adj. in -eus to *idōn.

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