The Collaborative International Dictionary of English v.0.48:

Uncalculating \Uncalculating\
   See calculating.

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "uncalculating":
   arbitrary, capricious, careless, guileless, heedless, inadvertent,
   inconsiderate, reasonless, thoughtless, unaffected, unassumed,
   unassuming, unbeguileful, unbeguiling, undeceitful, undeceiving,
   undeceptive, undesigning, undisguised, undisguising, undissembling,
   undissimulated, undissimulating, unfeigned, unfeigning,
   unflattering, unguarded, unpretended, unpretending, unreasoning,
   unreflecting, unthinking, unthoughtful, untrimmed, unvarnished