The word "feeblemindednesses" refers to a state of being mentally weak or impaired. Some antonyms for this word could be "smartness," "intelligence," "clarity," "sharpness," or "acuteness." These words describe the opposite of feeblemindedness, which is a state of being mentally strong and capable. Other antonyms for feeblemindedness might include "perceptive," "insightful," "astute," "keen," "alert," and "aware." Each of these words implies mental awareness, sharpness, and keenness, traits that are the opposite of feeblemindedness. Employing these antonyms can help to emphasize the opposite qualities of mental strength and clarity, highlighting the contrast between the two states of mind.