Quintilian 1.11.10 (tr. Donald A. Russell):
The forehead can go wrong in many ways. I have seen many who raised their eyebrows at every effort of their voice, others whose brows were always bent, others again who could not keep them level, one making its way to the top of the head, and the other almost covering the eye itself.
nam frons pluribus generibus peccat. vidi multos quorum supercilia ad singulos vocis conatus adlevarentur, aliorum constricta, aliorum etiam dissidentia, cum alterum in verticem tenderet, altero paene oculus ipse premeretur.