Going from Luxembourgish to Tigrinya (ትግርኛ) has a composite linguistic distance of 83% (heuristic estimate). Below is the dimension-by-dimension breakdown.
Shared vocabulary, cognates, and loanwords.
Morphology, syntax, word order, cases.
Shared sounds and phoneme inventory.
Latin → Ge'ez
Indo-European ↔ Afro-Asiatic
The 5 languages with the lowest linguistic distance from Luxembourgish:
A quick 3-question check between Luxembourgish and Tigrinya. No signup.