Not reacting or replying to something; not showing any response to stimulation or communication.
From the prefix 'un-' (not) combined with 'responsive' (from Latin 'respondere' meaning 'to answer back'). The prefix negates the sense of reacting or engaging.
In medicine, 'unresponsive' is one of the scariest words—it describes coma patients whose brains aren't firing signals anymore, but the same word describes someone ignoring your texts, showing how one word carries vastly different weights.
Complete word intelligence in one call. Free tier — 50 lookups/day.