unsettled

adj

1. Disturbed, upset.

   “I was unsettled by the sudden outburst, and since I didn't know what to do I just stood there, confused.”

   “Universal Directory of Railway Officials and Railway Year Book, 1946-47. […] Although the preparation of the fifty-second edition of this well-known work proved a far from easy task, owing to the continuance of unsettled conditions in many parts of the world, the response to the endeavours of the publishers to obtain accurate and complete information has exceeded anything that would have been possible twelve months earlier.”

2. Not in a steady condition, uncertain, subject to change.
3. Not populated, having no settlers or other inhabitants.
4. Unpaid.

   “We need to settle this bill; even if you think the charge is too high we can't just leave it unsettled.”

verb

1. (form-of, participle, past)simple past and past participle of unsettle