no
No, excitingly is one word so you would not use a hyphen in it.
The dictionaries that list it use a hyphen.
It's not a word in the dictionary, so yes, use the hyphen.
Yes, you can use a hyphen in a three-syllable word to separate its component parts or to indicate a compound adjective.
You do not use a hyphen when writing square feet. Using a hyphen would make it one word which should not be the case.
A hyphen is a "dash" that we use to put a compound word together. Such as 24-hour clock or 42-foot.
Stepmother is one word. So, you do not have to use a hyphen. Similarly: stepfather, stepsister, etc.
No. that is the way it is spelled: postpone.
No. Neither overemphasize or overemphasis use hyphens.
No. Through common usage, the words inpatient and outpatient no longer use the hyphen that characterized early spellings.
lifetime is just one word and you don't use a hyphen. (example): Hopefully my parents won't die during my lifetime.
To separate the words that form the compound word.