Analysis:
My explanation: I felt it without thinking. Such as size, red, cold, etc. , can be intuitively understood.
According to the dictionary's interpretation of intuition, it means "to understand or learn something directly without conscious reasoning." In other words, intuition is "the ability to make the right decision without enough information." Just because it is not obtained through conscious thinking or reasoning, it seems to be a feeling of falling from the sky and appearing out of thin air.
In fact, intuition is the primitive ability of human survival. Fisher, an expert in intuitive development, explained that before humans could use language for reasoning and induction, they could only rely on sensory and nonverbal intuition to identify danger. This instinct still exists, which is a kind of ability in parallel with conscious reasoning.
Besides the word intuition, there are many words to describe this ability. For example, premonition, sixth sense, inspiration, insight, inner voice or premonition.
Westerners also use a more vivid word to describe it. They call it "gutfeeling", as if all the internal organs can speak and send you information except the clear consciousness in the brain.