Classify the following phrase into its respective part of speech category
Frightening
Frightening is an adjective, a part of speech that is used to describe a noun.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following phrase into its respective part of speech category

### Input:
Frightening

### Output:
Frightening is an adjective, a part of speech that is used to describe a noun.