Here's why:
* "Like" is a preposition: It typically introduces a phrase that compares something to another thing. For example: "He looks *like* his father."
* Adjectives describe nouns: They tell us what kind of noun it is. For example: "He has *blue* eyes."
Instead of using "like" with adjectives, we usually use:
* "As" as a conjunction: This is used when we're comparing two things that are similar. For example: "She's *as* tall *as* her brother."
* "Very" or other adverbs: These words modify adjectives to intensify their meaning. For example: "He is *very* tall."
Incorrect: "He looks like tall."
Correct: "He looks tall."
Incorrect: "She is like happy."
Correct: "She is very happy."
Note: While "like" is not used directly with adjectives, it can be used in phrases that are similar to adjectives. For example: "He looks like someone who's always happy." This is a bit more complex, and we're actually describing the *noun* (someone) with an adjective (happy).