caülgyrelef: compromise; agreement in which neither party receives what they want (from tratracalma traülgyr elefí, lit. “least worthless/unfavorable contract”, i.e., a bad deal but the least bad deal possible).
sédelélef: mutually beneficial agreement; agreement in which both parties succeed (from trasédelékith elefí, lit. “mutually pleasing contract”.)
Traditionally, a caülgyref is what you end up with if you are unable to make a sédelélef; which may not be the result of one party being an obstinate idiot, but usually is.