уравнение
aequatio [onis, f]
произвольный
arbitrarius [a, um];
сжалиться
commiserescere [o,-,-];
misereri
subringi [or,-]; frontem rugare [1] / corrugare [1] ; vultum corrugare [1] / contrahere [o, xi, ctum] / obducere [o, xi, ctum] ; subducere supercilia; in sinus vel rugas contrahi [or, ctus sum]; replicari [or, atus sum] in rugas;