The Hebrew noun neatsa refers to contemptuous speech or behavior — the act of treating God or His covenant with scorn, reviling, or blasphemy. It is the verbal manifestation of a heart that rejects divine authority.
Neatsa describes the gravest form of covenant violation: open contempt for God Himself. In Numbers 14:11, God asks Moses, 'How long will they treat me with contempt (neatsa)?' — after Israel refuses to enter the Promised Land despite miraculous signs. Isaiah 60:14 reverses this: those who afflicted Israel will bow down and call them 'the City of the LORD.' The word frames the seriousness of unbelief and the scandal of blasphemy — treating the holy as worthless.