Chapter Words Relating to the Intellectual Faculties of Index by Roget's Thesaurus

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.