To render uncertain, etc., to perplex, embarrass, confuse, confound, bewilder, disorientate.
(Phrases). To tremble in the balance; to hang by a thread.
(Adjectives). Uncertain, doubtful, dubious, precarious 665, chancy, casual, random, contingent, indecisive, dependent on circumstances, undecided, pending, pendent, vague, indeterminate, indefinite, ambiguous, undefined, equivocal, undefinable, puzzling, enigmatic, questionable, apocryphal, problematical, hypothetical, controvertible, fallible, fallacious, suspicious, fishy, slippery, ticklish, debatable.
Unauthentic, unconfirmed, undemonstrated, undemonstrable.