Here's why:
* Meaning: "Shy" describes a personality trait or a feeling of timidity or nervousness. These qualities aren't easily measured on a scale like size or height.
* Alternatives: We use other words or phrases to express varying degrees of shyness:
* More timid/nervous/hesitant: This is a more general way to describe a higher level of shyness.
* Extremely shy/very shy/intensely shy: These emphasize the severity of the shyness.
* Bashful/timid/diffident: These are synonyms for "shy" that can be used to suggest different nuances.
In summary, while "shy" doesn't have specific comparative and superlative forms, we can express varying degrees of shyness using other words and phrases.