What part of speech is the word casual?

The word "casual" can be a few different parts of speech depending on how it's used in a sentence:

* Adjective: This is the most common use. It describes something that is informal, relaxed, or lacking in formality.

* Example: "She wore a casual outfit to the party."

* Noun: It can refer to a person who is informal or relaxed, or a casual worker (someone who is not a full-time employee).

* Example: "He's a bit of a casual when it comes to his work."

* Adverb: It can modify a verb, adjective, or other adverb, meaning "in a casual way."

* Example: "They talked casually about their plans."

So, to determine the part of speech of "casual," you need to look at how it is used in the sentence.