not established or confirmed
subject to change
lacking or indicating lack of confidence or assurance
ambiguous (especially in the negative)
not certain to occur; not inevitable
not consistent or dependable
not established beyond doubt; still undecided or unknown
not secure; beset with difficulties
inclined to shake as from weakness or defect
vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze
