The Collaborative International Dictionary of English v.0.48:

Issueless \Is"sue*less\, a.
   Having no issue or progeny; childless. "The heavens . . .
   have left me issueless." --Shak.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "issueless":
   acarpous, arid, barren, celibate, childless, desert, desolate,
   drained, dried-up, dry, exhausted, fallow, fruitless, gaunt,
   gelded, impotent, ineffectual, infecund, infertile, jejune,
   leached, menopausal, nonfertile, nonproducing, nonproductive,
   nonprolific, sine prole, sterile, sucked dry, teemless,
   uncultivated, unfertile, unfruitful, unplowed, unproductive,
   unprolific, unsown, untilled, virgin, waste, wasted,
   without issue