not capable of being precisely or readily described; not easily put into words; "an indefinable feeling of terror"; "an abstract concept that seems indefinable"
defying expression or description; "indefinable yearnings"; "indescribable beauty"; "ineffable ecstasy"; "inexpressible anguish"; "unspeakable happiness"; "unutterable contempt"; "a thing of untellable splendor"
enclosed in a protective covering; sometimes used in combination; "his sheathed sword"; "the cat's sheathed claws"; "a ship's bottom sheathed in copper"; "copper-sheathed"