1. He is outgoing.

2. He is extrovert.
3. He is extroverted.
(Are they all grammatical and the same in meaning?)

4. He is shy.
5. He is reserved.
6. He is introvert.
7. He is introverted.
(Are they all grammatical and the same in meaning?)

2. He is an extrovert.

6. He is an introvert.

All the others are correct. And yes, 1-3 mean about the same thing, and 4-7 mean about the same thing.

1. Yes, "He is outgoing" is grammatical and means that the person is social, friendly, and enthusiastic in their interactions with others.

2. "He is extrovert" is grammatically incorrect because "extrovert" is a noun, not an adjective. To make it grammatically correct, you would need to say "He is an extrovert", which means the same as "He is outgoing."

3. "He is extroverted" is grammatical and means the same as "He is outgoing." "Extroverted" is the adjective form of the noun "extrovert."

4. Yes, "He is shy" is grammatical and means that the person is reserved or hesitant in social situations. They may feel nervous or uncomfortable when interacting with others.

5. Yes, "He is reserved" is grammatical and means that the person is cautious or restrained in their behavior or communication. They may prefer to keep to themselves or limit their interactions with others.

6. "He is introvert" is grammatically incorrect because "introvert" is a noun, not an adjective. To make it grammatically correct, you would need to say "He is an introvert." This means that the person tends to be more focused on their internal thoughts and feelings and may prefer solitude or smaller social gatherings.

7. Yes, "He is introverted" is grammatical and means the same as "He is an introvert." "Introverted" is the adjective form of the noun "introvert." It describes someone who is more reserved, thoughtful, and energized by time alone.