Not capable of being precisely or readily described; not easily put into words.
synonym: indefinable.
Roget 475:
uncertain;
casual;
random
etc.
(aimless)
621;
changeable
etc.
149.
doubtful,
dubious;
indecisive;
unsettled,
undecided,
undetermined;
in suspense,
open to discussion;
controvertible;
in question
etc.
(inquiry)
461.
vague;
indeterminate,
indefinite;
ambiguous,
equivocal;
undefined,
undefinable;
confused
etc.
(indistinct)
447;
mystic,
oracular;
dazed.
perplexing
etc.
v.;
enigmatic,
paradoxical,
apocryphal,
problematical,
hypothetical;
experimental
etc.
463.
unpredictable,
unforeseeable
(unknowable)
519.
fallible,
questionable,
precarious,
slippery,
ticklish,
debatable,
disputable;
unreliable,
untrustworthy.
contingent,
contingent on,
dependent on;
subject to;
dependent on circumstances;
occasional;
provisional.
unauthentic,
unauthenticated,
unauthoritative;
unascertained,
unconfirmed;
undemonstrated;
untold,
uncounted.
in a state of uncertainty,
in a cloud,
in a maze;
bushed,
off the track;
ignorant,
etc.
491;
afraid to say;
out of one's reckoning,
astray,
adrift;
at sea,
at fault,
at a loss,
at one's wit's end,
at a nonplus;
puzzled
etc.
v.;
lost,
abroad,
d_esorient_e;
distracted,
distraught.
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Roget 517:
unmeaning;
meaningless,
senseless;
nonsensical;
void of sense
etc.
516.
inexpressive,
unexpressive;
vacant;
not significant
etc.
516;
insignificant.
trashy,
washy,
trumpery,
trivial,
fiddle-faddle,
twaddling,
quibbling.
unmeant,
not expressed;
tacit
etc.
(latent)
526.
inexpressible,
undefinable,
incommunicable.
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Roget 519:
unintelligible,
unaccountable,
undecipherable,
undiscoverable,
unknowable,
unfathomable;
incognizable†,
inexplicable,
inscrutable;
inapprehensible†,
incomprehensible;
insolvable†,
insoluble;
impenetrable.
illegible,
as Greek to one,
unexplained,
paradoxical;
enigmatic,
enigmatical,
puzzling
(secret)
533;
indecipherable.
obscure,
dark,
muddy,
clear as mud,
seen through a mist,
dim,
nebulous,
shrouded in mystery;
opaque,
dense;
undiscernible
etc.
(invisible)
447†;
misty
etc.
(opaque)
426;
hidden
etc.
528;
latent
etc.
526.
indefinite,
garbled
etc.
(indistinct)
447;
perplexed
etc.
(confused)
59;
undetermined,
vague,
loose,
ambiguous;
mysterious;
mystic,
mystical;
acroamatic†,
acroamatical†;
metempirical;
transcendental;
occult,
recondite,
abstruse,
crabbed.
inconceivable,
inconceptible†;
searchless†;
above comprehension,
beyond comprehension,
past comprehension;
beyond one's depth;
unconceived.
inexpressible,
undefinable,
incommunicable.
unpredictable,
unforeseeable.
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Polish: niedefiniowalny