The abstract noun "deceit" can be stated as the verb "lied." Alternate translation: "But the sons of Jacob lied to Shechem and Hamor when they answered them" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
This means that Shechem had greatly dishonored and disgraced Dinah by forcing her to sleep with him. See how you translated "defiled" in [Genesis 34:5](./05.md).