Yes, it is a compound adjective and should be hyphenated. In that context, 'hard' is an adverb modifying 'working'. If you do not hyphenate it, you are using two separate adjectives, 'hard' and 'working'.
No, "hardworking" is not hyphenated.
more hardworking, most hardworking
Hardworking as a dog or beaver cuz animals word hard or hardworking as a builder cuz they work hard to build houses and buildings?
It is not hyphenated.
Hardworking is the correct spelling.
Motorcycle is not hyphenated
No it's not hyphenated.
The comparative degree of "hardworking" is "more hardworking," and the superlative degree is "most hardworking." Since "hardworking" is a two-syllable adjective, it typically uses "more" and "most" rather than the "-er" and "-est" forms. For example, you might say, "She is more hardworking than her colleague," or "He is the most hardworking member of the team."
John is very hardworking
words are only hyphenated when they have a separate meaning when separated than they do when hyphenated
Yes it should be hyphenated.
It can be. Some words can be seen both hyphenated and non-hyphenated.