No, 'nowadays' is an example of informal language.
Formal is not a compound word.
These kids, nowadays!
No, formal is an adjective, the adverb is formally.
Formal is an adjective.
Informal? semi-formal
Another word for a formal speech is an oration or a discourse.
In history we used to write letters, nowadays we send emails.
A formal disapproval is a reprimand.
Yes, nowadays is a proper word, it's an adverb, a word to modify a verb as 'at the present time'. For example:Nowadays we take fewer trips than we used to.
3...
yes
Yes, "aloof" is considered a formal word. It is often used to describe someone who is emotionally distant or detached in social situations.