WordNet (r) 3.0 (2006):

wispy
    adj 1: thin and weak; "a wispy little fellow with small hands
           and feet"- Edmund Wilson [syn: wisplike, wispy]
    2: lacking clarity or distinctness; "a dim figure in the
       distance"; "only a faint recollection"; "shadowy figures in
       the gloom"; "saw a vague outline of a building through the
       fog"; "a few wispy memories of childhood" [syn: dim,
       faint, shadowy, vague, wispy]

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "wispy":
   airy, attenuate, attenuated, boyish, breakable, brittle,
   cheap-jack, cobwebby, crumbly, dainty, delicate, delicately weak,
   diaphanous, diluted, effeminate, ethereal, fine, fine-drawn,
   finespun, flimsy, fragile, frail, frangible, gauzy, gimcrack,
   gimcracky, girlish, gossamer, gossamery, gracile, insubstantial,
   jerry, jerry-built, lacy, light, lightweight, misty, namby-pamby,
   papery, pasteboardy, puny, rare, rarefied, shattery, sissified,
   sleazy, slender, slenderish, slight, slight-made, slim, slimmish,
   slinky, small, subtle, svelte, sylphlike, tacky, tenuous, thin,
   thin-bodied, thin-set, thin-spun, thinnish, threadlike,
   unsubstantial, vague, wasp-waisted, watered, watered-down, watery,
   weak, willowy, wiredrawn, womanish