In formal writing, fun is always a noun. Any use of fun as adjective is informal and generally not preferred. If you were to come across a sentence in a grammar book “fun” would always be a predicate nominative.

In the sentence “Hiking is fun,” the word “fun” is an adjective. What should someone look for? Is the build type like “My mother is tall…” or “my mother is tall (literally)?”? The

word “Fun” can be a noun as well as an adjective, and the verb “is” can link two nouns (“My mother is a teacher”), so I can see where you might be confused. What English speakers could understand from the sentence “Hiking is fun,” almost as if it were shorthand for “Hiking is a fun thing to do.” What

is a standard in English language schools?

In the sentence “Hiking is fun,” the word “fun” is an adjective. What should someone look for? Is the build type like “My mother is tall…” or “my mother is tall (literally)?”? The

word “Fun” can be a noun as well as an adjective, and the verb “is” can link two nouns (“My mother is a teacher”), so I can see where you might be confused. What English speakers could understand from the sentence “Hiking is fun,” almost as if it were shorthand for “Hiking is a fun thing to do.” What

is a standard in English language schools?

Often “fun” is termed as an adverb, but the truth is it is noun. Is hiking is such fun?

What are the best hikes to do every day?

whereas generally when the category of the word is less controversial, such specifies nouns, not adjectives, and so specifies adjectives, not nouns:

*Hiking is such enjoyable.

*Hiking is drudgery/championship.

Will the answer be a noun or an adjective?

Often “fun” is termed as an adverb, but the truth is it is noun. Is hiking is such fun?

What are the best hikes to do every day?

whereas generally when the category of the word is less controversial, such specifies nouns, not adjectives, and so specifies adjectives, not nouns:

*Hiking is such enjoyable.

*Hiking is drudgery/championship.

Will the answer be a noun or an adjective?

Often “fun” is termed as an adverb, but the truth is it is noun. Is hiking is such fun?

What are the best hikes to do every day?

whereas generally when the category of the word is less controversial, such specifies nouns, not adjectives, and so specifies adjectives, not nouns:

*Hiking is such enjoyable.

*Hiking is drudgery/championship.

Will the answer be a noun or an adjective?

In formal writing, fun is always a noun. Any use of fun as adjective is informal and generally not preferred. If you were to come across a sentence in a grammar book “fun” would always be a predicate nominative.