Synonyms:
undefined, vague
Meaning: not precisely limited, determined, or distinguished; "an undefined term"; "undefined authority"; "some undefined sense of excitement"; "vague feelings of sadness"; "a vague uneasiness"
Usage examples
An undefined sense of injury crept into her heart.
Every time the Colonel came into the real estate office Washington's heart bounded and his eyes lighted with hope, but it always turned out that the Colonel was merely on the scent of some vast, undefined landed speculation--although he was customarily able to say that he was nearer to the all-necessary ingredient than ever, and could almost name the hour when success would dawn.