from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Not known or established; questionable: domestic changes of great if uncertain consequences.
- adj. Not determined; undecided: uncertain plans.
- adj. Not having sure knowledge: an uncertain recollection of the sequence of events.
- adj. Subject to change; variable: uncertain weather.
- adj. Unsteady; fitful: uncertain light.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. not known for certain; questionable
- adj. not yet determined; undecided
- adj. variable and subject to change
- adj. fitful or unsteady
- adj. unpredictable or capricious
from the GNU version of the Collaborative International Dictionary of English
- adj. Not certain; not having certain knowledge; not assured in mind; distrustful.
- adj. Irresolute; inconsonant; variable; untrustworthy.
- adj. Questionable; equivocal; indefinite; problematical.
- adj. Not sure; liable to fall or err; fallible.
- transitive v. To make uncertain.
from The Century Dictionary and Cyclopedia
- Not certain; doubtful.
- Not known as regards quantity or extent; indefinite; problematical: as, an uncertain number of independent voters; a person of uncertain age.
- Having doubts; without certain knowledge; not sure.
- Not sure as to aim or effect desired.
- Unreliable; insecure; not to be depended on.
- Not firm or fixed; vague; indeterminate in nature; fluctuating.
- Undecided; hesitating; not resolved.
- Not steady; fitful.
- Liable to change; fickle; inconstant; capricious; irresolute.
- To make or cause to be uncertain.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. not established or confirmed
- adj. not established beyond doubt; still undecided or unknown
- adj. ambiguous (especially in the negative)
- adj. subject to change
- adj. not certain to occur; not inevitable
- adj. not consistent or dependable
- adj. lacking or indicating lack of confidence or assurance
un- + certain (Wiktionary)