Romanian word promiscuu comes from Latin pro-, Latin miscere

Detailed word origin of promiscuu

Dictionary entry	Language	Definition
pro-	Latin (lat)	(prefixed to verbs of utterance) in place of, on behalf of. (temporally) prior, fore-. Action directed forward or in front. Advantage. Bringing into being, forth, or into the open. Downward and forward movement. Forward direction, forward movement. Prominence.
miscere	Latin (lat)
promiscuus	Latin (lat)	(grammar) epicene. Common, usual, general. Indiscriminate, promiscuous. Not separate or distinct, mixed; mutual, shared.
promiscuu	Romanian (ron)

Words with the same origin as promiscuu