A good prefix is dis- for advantage. You can use it like, "We had a disadvantage in the game because our points were lower."
Disappoint or Reappoint
The prefix "un-" means not, so "unreal" would mean not real or imaginary.
Upon reflecting on the situation, she realized that she needed to take action.
The prefix you would use with "cent" to mean center is "ec-" (as in eccentric).
Reuse
Disappoint or Reappoint
nothing but you can change the context of your sentace
You can use deflect in a sentace such as: When the ball is kicked my way, I do my best to deflect it to a teamate.
For negation, I would use im-
It is an adjective. For example: I hugged my best friend sympathetically after her grandmother had past away.
The water spiraled down the sink outlet, due to the coreolis effect.
monosaccharides
The prefix "un-" means not, so "unreal" would mean not real or imaginary.
Upon reflecting on the situation, she realized that she needed to take action.
The prefix you would use with "cent" to mean center is "ec-" (as in eccentric).
Reuse
he was at a greater advantage as he did not skip his previous class unlike his friend