The Collaborative International Dictionary of English v.0.48:

Unhatched \Unhatched\
   See hatched.

WordNet (r) 3.0 (2006):

unhatched
    adj 1: not yet emerged from an egg

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "unhatched":
   ad-lib, caught napping, caught off balance, caught short,
   extemporaneous, extemporized, haphazard, hasty, impromptu,
   improvised, makeshift, precipitate, rough-and-ready, snap,
   surprised, taken aback, taken by surprise, taken unawares,
   tripped up, unarranged, unbegun, unconcocted, uncontrived,
   undeliberated, undevised, unmade, unmanufactured, unorganized,
   unplanned, unpremeditated, unprepared, unprimed, unready,
   unstudied