Synonyms for Un observable:

• adj.

  •impalpable (adjective)
  • nebulous,
  • airy,
  • disembodied,
  • tenuous,
  • delicate,
  • incorporeal,
  • insubstantial,
  • imperceptible,
  • unperceivable,
  • imprecise,
  • unobservable,
  • thin,
  • unapparent.
  •intangible (adjective)
  • rare,
  • dim,
  • elusive,
  • evasive,
  • unreal,
  • abstract,
  • slender,
  • unsure,
  • eluding,
  • ethereal,
  • abstruse,
  • unsubstantial,
  • uncertain,
  • Evading,
  • indeterminate,
  • hypothetical.
  •invisible (adjective)
  • supernatural,
  • vaporous,
  • wraithlike,
  • occult,
  • out of sight,
  • concealed,
  • unviewable,
  • Screened,
  • ungraspable,
  • ulterior,
  • obliterated,
  • unseeable,
  • disguised,
  • ghostly,
  • covert,
  • deceptive,
  • not in sight,
  • veiled,
  • masked,
  • unseen,
  • Obscured,
  • Perdu,
  • gaseous,
  • undisclosed,
  • ideal.
  •unobservable (adjective)
  • ephemeral,
  • infinitesimal,
  • intangible,
  • imponderable,
  • inconspicuous,
  • slight,
  • vague,
  • insensible,
  • unnoticeable,
  • fine,
  • subtle,
  • microscopic,
  • tiny,
  • undetectable,
  • insignificant,
  • indistinct,
  • indistinguishable,
  • evanescent,
  • inaudible,
  • invisible,
  • trivial,
  • inconsiderable,
  • inappreciable,
  • impalpable,
  • gradual,
  • indiscernible,
  • small,
  • minute,
  • momentary,
  • shadowy.

Antonyms for Un observable:

• adj.

  • impalpable
    palpable, substantial, understandable, tangible, believeable, perceptible.
  • imponderable
    large, important, thick, big, significant, rough, huge.
  • intangible
    obvious, factual, real, definite.
  • invisible
    detectable, visible, seen.