hollow-hearted

The Century Dictionary: The Encyelopedic Lexicon of the English Language · 1887 · p. 200

(hol’6-hir’ted), a. Insincere; of deceitful; not sound or true. in To our shores wood Throng many doubtful hollow-hearted friends. The Shak., Rich. IIL, iv. 4. tree The The hollow-hearted, disaffected, And close malignants are detected. S. Butler, Hudibras, IT. ii. 553.