No, biweekly is not hyphenated. It is worth mentioning that this term can be ambiguous: some people will think it means every two weeks, and others will think it means twice a week. You might want to consider using a term that is clearer: for example you can say "twice weekly" or "semiweekly" to mean twice a week, and "every other week" to mean "every two weeks".
No it's not hyphenated: biweekly.
The spelling is one word, non-hyphenated, "biweekly" (every two weeks).
No it doesn't need to be hyphenated.
I wouldn't think so. I mean, "bi-cycle" doesn't sound right, does it?
No the word "midday" is not hyphenated.
No, the word biweekly is an adjective, a word that describes a noun, for example a biweekly meeting, a biweeklyschedule.
No it doesn't.
The word desperate hyphenated
Yes it should be hyphenated.
Yes it should be hyphenated.
Light-Headed is a hyphenated word.
The word "self-confidence" is hyphenated.