"More numbing" refers to something that causes a loss of sensation or feeling to an even greater degree than before. The antonym for this phrase would be "less numbing," describing something that reduces or diminishes the loss of sensation or feeling. Other antonyms for "more numbing" could include "stimulating," "revitalizing," "energizing," "invigorating," or "awakening," all of which suggest a restoration or enhancement of sensation and feeling rather than a decrease or numbing. The choice of antonym depends on the context and desired effect, but any of these would serve as a direct opposition to "more numbing.