The phrase "sees in one's mind" refers to the ability to visualize or imagine something in one's thoughts. Antonyms for this phrase would include words or phrases that describe an inability to visualize, such as "blind to the mind's eye," "mentally barren," or "cannot conceive." Other antonyms might be descriptors of a lack of imagination or creativity, such as "concrete thinking," "lacks inspiration," or "prosaic imagination." Conversely, synonyms might include phrases such as "vivid visualizing," "creative visualization," or "flourishing imagination." Ultimately, the antonyms for "sees in one's mind" depend on what aspect of visualization or imagination is being emphasized.