Uneki UN Unweighted index of differential covariation Unbelief is characterized as disobedience. UNPI Universal Network Programming Interface Undecaprenyl-phosphate mannosyltransferase Unfavourable balance of international payment unbonded prestressed continuous concrete slab Untangling the statistics seems impossible. undifferentiated squamous carcinoma of tongue unutterable loneliness/sadness/pleasure unmanned reconnaissance/attack air vehicle