pĕr-ĭnīquus — Lewis & Short
pĕr-ĭnīquus, a, um, adj.
I Very unfair, very unjust:
quare videant, ne sit periniquum et non ferendum,Cic. Imp. Pomp. 22, 63.—
II Very unwilling, very discontented:
etsi periniquo patiebar animo, te a me digredi,Cic. Fam. 12, 18, 1.