The word "aculeate" means sharp, pointed, or prickly. Antonyms for this term would be dull, blunt, or rounded. "More aculeate" implies an increase in sharpness or pointedness, so antonyms for this phrase would include "less sharp," "less pointed," "blunter," or "rounder." Some other antonyms that could be used in place of "more aculeate" include "smooth," "soft," "supple," "malleable," and "flexible." These terms suggest an absence of sharpness or pointedness and instead indicate qualities of smoothness, pliability, or gentleness.