WordNet (r) 3.0 (2006):

robotlike
    adj 1: resembling the unthinking functioning of a machine; "an
           automatic `thank you'"; "machinelike efficiency" [syn:
           automatic, automatonlike, machinelike, robotlike,
           robotic]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "robotlike":
   accordant, alike, automatic, balanced, consistent, consonant,
   constant, continuous, correspondent, equable, equal, even, flat,
   homogeneous, immutable, invariable, level, measured, mechanical,
   methodic, monolithic, of a piece, ordered, orderly, persistent,
   regular, smooth, stable, steadfast, steady, systematic, unbroken,
   unchangeable, unchanged, unchanging, undeviating, undifferentiated,
   undiversified, uniform, unruffled, unvaried, unvarying