DISPROPORTIONAL
disproportional, disproportionate
(adjective) out of proportion
Source: WordNet® 3.1
Etymology
Adjective
disproportional (comparative more disproportional, superlative most disproportional)
disproportionate
Source: Wiktionary
Dis`pro*por"tion*al, a.
Definition: Not having due proportion to something else; not having
proportion or symmetry of parts; unsuitable in form, quantity or
value; inadequate; unequal; as, a disproportional limb constitutes
deformity in the body; the studies of youth should not be
disproportional to their understanding.
Source: Webster’s Unabridged Dictionary 1913 Edition