Yes, "younger-looking" should have a hyphen when used as a compound adjective before a noun. The hyphen clarifies that "younger" modifies "looking" as a single idea describing the noun that follows. For example, you would write "She has a younger-looking appearance."
No, "good looking" does not have a hyphen when used as a predicate adjective, as in "She is good looking." However, when used as a compound adjective before a noun, it is often hyphenated: "He is a good-looking man."
No, a hyphen is not needed.
without a hyphen idiot
No. Fully, when used as an adverb, is not followed by a hyphen. :)
There should be a hyphen in twenty-three.
I believe anything-American is hyphenated and the hyphen takes the place of ' and. '
You do not use a hyphen when writing square feet. Using a hyphen would make it one word which should not be the case.
no a hyphen doesnt touch rain a hyphen never touches rain at any cicumstances
No, there shouldn't be.
Nah.
A hyphen is not required.
Yes, "year-end" should have a hyphen when used as an adjective, such as in "year-end report." However, when used as a noun, it can be written as "year end" without a hyphen. The hyphen helps clarify that the two words function together as a single descriptive term.