Englishunclear
adjective
it was unclear how much fluid had leaked out:
uncertain, unsure, unsettled, up in the air, debatable, open to question, in doubt, doubtful, unpredictable, unforeseeable, incalculable, speculative;
ambiguous, inexact, imprecise, inexplicit, ill-defined, equivocal, indefinite, vague, abstruse, puzzling, perplexing, mysterious, arcane, cryptic, obscure, confused, confusing, hazy, misty, foggy, fogged, clouded, lacking definition, nebulous;
informal iffy, dicey;
British, informal dodgy.
▷antonyms clear, evident, certain.