"if not settled" is a correct and usable phrase in written English.
It can be used in a sentence to express a condition or situation that must be resolved or taken care of. Example: "If not settled soon, the dispute between the two companies could escalate into a costly legal battle." In this sentence, "if not settled" implies that if the dispute is not resolved or settled in the near future, it will result in a negative consequence (escalating into a costly legal battle).
The lawyers said that the case, if not settled, was expected to be tried next year.
How long the E.U.-Canada negotiation will take remains to be seen, but the fact that it was carefully "scoped" over the past months leads to the reasonable expectation that the talks will go forward promptly, outstanding issues having been identified if not settled in advance.
These antitrust challenges are currently in the discovery stage but, if not settled, could lead to further inquiry about the power of teams in a sports league to collectively sell broadcast rights.
The infant may cry for a certain time, and if not settled to sleep by this time, parental reassurance is required.
Any dispute regarding the interpretation or application of this Constitution, if not settled by the Commission, shall be referred to a committee composed of one member appointed by each of the parties to the dispute, and in addition an independent chairman chosen by the members of the committee.
The two tests in the Tour de France may help expand, if not settle, the argument.
The new review, in the journal PLOS One, should give doctors and patients a better sense of what to expect from various forms of talk therapy, experts said, if not settle long-running debates in psychiatry about the relative merits of one treatment over another.
And if it's not settled before the convention?
But it is so important because if they are not settled they will not learn".
If this is not settled to your satisfaction your only other option may be to take legal action for compensation.
Another definition says that old growth forests look largely as they would if Europeans had not settled North America.
