plural of disproportion

The state of being out of proportion; an abnormal or improper ratio; an imbalance. / Lack of suitableness, adequacy, or due proportion to an end or use; unsuitableness.

(transitive) To make unsuitable in quantity, form, or fitness; to violate symmetry in; to mismatch.

disproportionate

Badly proportioned; disproportionate.

present participle of disproportion

The situation where the capacity of the pelvis is inadequate to allow the fetus to negotiate the birth canal.