Meaning

verb make numb or insensitive

adjective lacking sensation

adjective (followed by `to') not showing human feeling or sensitivity; unresponsive

originFrom the past participle of nim (“to take”). Compare German benommen (“dazed, numb”) and Old Norse numinn. The final ⟨b⟩ is a later addition; it was never pronounced, and did not appear in the original word.

Etymology from Wiktionary, CC BY-SA 3.0