The phrase "like a shot" connotes quickness and swiftness, but there are several antonyms to this expression. Rather than acting impulsively and hastily, someone who does the opposite could be described as methodical or deliberate. They may take their time to assess situations carefully, weighing the pros and cons before making a move. They are likely to be cautious and measured, rather than impulsive and spontaneous. Others may describe them as prudent or calculating. Alternatively, one might describe the opposite of "like a shot" as "like molasses" to highlight the contrast between speed and slowness.