The Collaborative International Dictionary of English v.0.48:

Lenten \Lent"en\ (l[e^]nt"'n), n.
   Lent. [Obs.] --Piers Plowman.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lenten \Lent"en\, a. [From OE. lenten lent. See Lent, n. ]
   1. Of or pertaining to the fast called Lent; used in, or
      suitable to, Lent; as, the Lenten season.
      [1913 Webster]

            She quenched her fury at the flood,
            And with a Lenten salad cooled her blood. --Dryden.
      [1913 Webster]

   2. Spare; meager; plain; somber; unostentatious; not abundant
      or showy. "Lenten entertainment." " Lenten answer."
      --Shak. " Lenten suit." --Beau. & Fl.
      [1913 Webster]

   Lenten color, black or violet. --F. G. Lee.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lenten
    adj 1: of or relating to or suitable for Lent; "lenten food"

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "Lenten":
   Apostolic, Encratic, Pythagorean, Rechabite, Shaker, Spartan,
   Stoic, abstemious, abstinent, ascetic, austere, celibate, chaste,
   continent, dwarfed, dwarfish, exiguous, fasting, frugal,
   fruitarian, impoverished, jejune, lean, limited, meager, mean,
   miserly, narrow, nephalistic, niggardly, on the wagon, paltry,
   parsimonious, poor, puny, quadragesimal, scant, scanty, scrawny,
   scrimp, scrimpy, sexually abstinent, skimp, skimpy, slender,
   slight, slim, small, spare, sparing, starvation, stingy, stinted,
   straitened, stunted, subsistence, sworn off, teetotal, thin,
   uneating, unfed, unnourishing, unnutritious, vegetarian, watered,
   watery