Definitions
1.verbTo make upset or uncomfortable"Don't unsettle the horses or they'll bolt."
2.verbTo bring into disorder or disarray
3.adjectiveDisturbed, upset."I was unsettled by the sudden outburst, and since I didn't know what to do I just stood there, confused."
4.adjectiveNot in a steady condition, uncertain, subject to change.
5.adjectiveNot populated, having no settlers or other inhabitants.
6.adjectiveUnpaid."We need to settle this bill; even if you think the charge is too high we can't just leave it unsettled."