The word "lackadaisicalnesses" refers to a state of laziness or lethargy. Antonyms for this word would therefore include terms that convey the opposite meaning, such as "energetic," "active," "diligent," "hardworking," "enthusiastic," "motivated," "zealous," "lively," "vibrant," and "busy." These words all suggest a state of being actively engaged, focused, and committed to a task or activity, rather than being disengaged or indifferent. Other possible antonyms might include terms that convey a sense of urgency or intensity, such as "driven," "ambitious," "ardent," and "passionate.