Emily Dickinson Lexicon

FALSE'NESS, n. [fols'ness.]

1. Want of integrity and veracity, either in principle or in act; as, the falseness of a man's heart, or his falseness to his word.
2. Duplicity; deceit; double-dealing. Hammond.
3. Unfaithfulness; treachery; perfidy; traitorousness. The prince is in no danger of being betrayed by the falseness, or cheated by the avarice of such a servant. Rogers.