Calm, gentle, passionless, as he appeared, there was yet, we
fear, a quiet depth of malice, hitherto ________, but active now, in
this unfortunate old man, which led him to imagine a more
intimate revenge than any mortal had ever wreaked upon an
enemy.
Source: The Scarlet Letter
A. momentous
B. latent
C. fanciful
D. ponderous