The phrase "like absent-minded professor" typically brings to mind someone who is forgetful, disorganized, and easily distracted. Antonyms for this phrase might include descriptors like focused, prepared, alert, or attentive. Instead of being absent-minded, one might be described as present, engaged, vigilant, or even studious. Other antonyms for "like absent-minded professor" might include adjectives like efficient, responsible, reliable, prompt, and detail-oriented. Each of these descriptors implies a level of attention and diligence that is lacking in someone who is absent-minded. So, while the absent-minded professor may be a lovable character in popular culture, in real life, it's generally better to strive for the opposite of absent-mindedness.