from the GNU version of the Collaborative International Dictionary of English
- adj. Destitute of mettle, that is, or fire or spirit.
from The Century Dictionary and Cyclopedia
- Without mettle or spirit.
Sorry, no etymologies found.
Bowed down, the soldier made himself drunk, and the drink enlivened his dismettled heart; and in the evening he stole into the loft which is above the Big Seat of Capel Kingsend, purposing to disturb the praying men with loud curses.