indefinable

Adjective
  1. Not capable of being precisely or readily described;
    Not easily put into words (synset 300701136)
    "an indefinable feeling of terror"; "an abstract concept that seems indefinable"
  2. Defying expression or description (synset 300947318)
    "indefinable yearnings"; "indescribable beauty"; "ineffable ecstasy"; "inexpressible anguish"; "unspeakable happiness"; "unutterable contempt"; "a thing of untellable splendor"

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