1. （对…）过敏的
If you are allergic to something, you become ill or get a rash when you eat it, smell it, or touch it.

2. （反应）过敏的
If you have an allergic reaction to something, you become ill or get a rash when you eat it, smell it, or touch it.

3. （对…）十分反感的，厌恶的
If you say that you are allergic to something or someone, you mean that you dislike them very strongly and try to avoid them.

1. having an allergy or peculiar or excessive susceptibility (especially to a specific factor)

e.g. allergic children
hypersensitive to pollen

Synonym: hypersensitivehypersensitizedhypersensitisedsensitizedsensitisedsupersensitivesupersensitizedsupersensitised

2. characterized by or caused by allergy

e.g. an allergic reaction