Hyphens are surprisingly versatile, but because they are used in so many different ways, there are a lot of rules governing what they can and cannot do. You can often decide to hyphenate or not to hyphenate by assessing whether or not hyphenating would cause confusion or ambiguity. When in doubt, you can also consult a reliable Canadian dictionary or your in-house style guide.
WRONG: On campuses, the band was well-known.
REVISED: On college campuses, the band was well known.
OR
REVISED: On college campuses, they were a well-known band. (compound modifier precedes the noun)
WRONG: Still heavily-sedated from surgery, the patient struggled to stay awake.
REVISED: Still heavily sedated from surgery, the patient struggled to stay awake.
WRONG: Dalibor challenged his friends to donate one-week's pay to the hurricane relief effort.
REVISED: Dalibor challenged his friends to donate one week's pay to the hurricane relief effort.
WRONG: A film may reach "cult" status and be generally under-rated or over-looked.
REVISED: A film may reach "cult" status and be generally underrated or overlooked.
WRONG: This year alone, the price of life-like robots has increased at least two-fold.
REVISED: This year alone, the price of lifelike robots has increased at least twofold.
WRONG: The wind blew south-east at eight kilometres per hour.
REVISED: The wind blew southeast at eight kilometres per hour.