Going from Yiddish to Slovenian (Slovenลกฤina) has a composite linguistic distance of 73% (heuristic estimate). Below is the dimension-by-dimension breakdown.
Shared vocabulary, cognates, and loanwords.
Morphology, syntax, word order, cases.
Shared sounds and phoneme inventory.
Hebrew โ Latin
Indo-European โ Indo-European
The 5 languages with the lowest linguistic distance from Yiddish:
A quick 3-question check between Yiddish and Slovenian. No signup.