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Use "undefinably" in a sentence
"You can't actually give any reason for your "feeling" concerning this actual post as you claimed to originally but you think your accusation fits something undefinably wider."
"While wrapt up in this reverie, poignantly agitating, yet undefinably soothing, upon the return of Edgar to England, and his astonishing appearance in her room, her attention was again aroused by another gentle tap at the door."
"Subtly, undefinably it was of our world and of one not ours."