not established beyond doubt; still undecided or unknown | not precisely determined or established; not fixed or known in advance |
lacking or indicating lack of confidence or assurance | having a capacity for continuing to grow at the apex |
not certain to occur; not inevitable | of uncertain or ambiguous nature |
not established or confirmed | not leading to a definite ending or result |
ambiguous (especially in the negative) | (of a quantity) having no definite value, as an equation that cannot be solved |
not consistent or dependable | |
subject to change | |