The Collaborative International Dictionary of English v.0.48:

Variform \Va"ri*form\, a. [L. varius various + -form.]
   Having different shapes or forms.
   [1913 Webster]

WordNet (r) 3.0 (2006):

variform
    adj 1: varying in form or shape

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "variform":
   capricious, changeable, changing, choppy, deviating, deviative,
   deviatory, different, disorderly, divaricate, divergent,
   diversified, diversiform, erose, erratic, impulsive, inconsistent,
   inconstant, irregular, jagged, jerky, mercurial, motley, mutable,
   nonconformist, nonstandard, nonuniform, pluralistic, ragged, rough,
   spasmodic, sporadic, unequable, unequal, uneven, unorthodox,
   unstable, unsteady, unsystematic, ununiform, variable, variegated,
   various, varying, wavering