The Collaborative International Dictionary of English v.0.48:

Stony \Ston"y\, a. [Compar. Stonier; superl. Stoniest.] [AS.
   st[=a]nig. See Stone.]
   1. Of or pertaining to stone, consisting of, or abounding in,
      stone or stones; resembling stone; hard; as, a stony
      tower; a stony cave; stony ground; a stony crust.
      [1913 Webster]

   2. Converting into stone; petrifying; petrific.
      [1913 Webster]

            The stony dart of senseless cold.     --Spenser.
      [1913 Webster]

   3. Inflexible; cruel; unrelenting; pitiless; obdurate;
      perverse; cold; morally hard; appearing as if petrified;
      as, a stony heart; a stony gaze.
      [1913 Webster]

   Stony coral. (Zool.) Same as Stone coral, under Stone.
      [1913 Webster]

WordNet (r) 3.0 (2006):

stony
    adj 1: abounding in rocks or stones; "rocky fields"; "stony
           ground"; "bouldery beaches" [syn: rocky, bouldery,
           bouldered, stony]
    2: showing unfeeling resistance to tender feelings; "his flinty
       gaze"; "the child's misery would move even the most obdurate
       heart" [syn: flinty, flint, granitic, obdurate,
       stony]
    3: hard as granite; "a granitic fist" [syn: granitic,
       granitelike, rocklike, stony]

Moby Thesaurus II by Grady Ward, 1.0:

126 Moby Thesaurus words for "stony":
   Philistine, adamant, adamantine, bankrupt, beat, beggared, bony,
   broke, busted, callous, calloused, case-hardened, cement, cemental,
   chilly, cold, cold-blooded, coldhearted, concrete, corneous,
   corrugated, cragged, craggy, crinkled, crumpled, crystal,
   crystalline, dense, destitute, diamondlike, dure, flat, flat broke,
   flintlike, flinty, fortuneless, frigid, granitelike, granitic,
   gravelly, gritty, hard, hard as nails, hard-boiled, hardened,
   hardhearted, harsh, heartless, horny, icy, impervious, implacable,
   indifferent, indigent, indurated, inflexible, insensible,
   insensitive, intractable, inured, iron-hard, ironbound, ironlike,
   jagged, jaggy, lapideous, lithoid, lithoidal, marble, marblelike,
   merciless, monolithic, needy, obdurate, oofless, osseous,
   pachydermatous, pebbled, pebbly, penniless, pitiless, poor,
   porphyritic, poverty-stricken, proof against, ragged, resistant,
   resistive, rock-ribbed, rock-strewn, rock-studded, rockbound,
   rocklike, rocky, rugged, rugose, rugous, sandy, saw-toothed,
   sawtooth, scragged, scraggly, scraggy, serrate, serrated, shingled,
   shingly, snagged, snaggled, snaggy, solid, steeled against,
   steellike, steely, stone-broke, stonelike, strapped, thick-skinned,
   tough, trachytic, uncompassionate, unfeeling, unresponsive,
   unsentimental, unsympathetic, wrinkled