extenuate

v. t.

  1. To make thin or slender; to draw out so as to lessen the thickness.
  2. To lessen; to palliate; to lessen or weaken the force of; to diminish the conception of, as crime, guilt, faults, ills, accusations, etc.; -- opposed to aggravate.
  3. To lower or degrade; to detract from.

v. i.

  1. To become thinner; to make excuses; to advance palliating considerations.

a.

  1. Thin; slender.