Un
Pre
Mis
Re
Anti
100

Unbearable

You cannot bear something

100

Prealgebra 

Before algebra 

100

misguided

guided incorrectly

100

rearrange

arrange again

100

antibullying

not bullying

200

Unfazed

It doesn't bother you

200

Preseason

Before the season


200

misprint

to print incorrectly

200

reconsider

consider again

200

antisocial

not social

300

Unreliable 

You can't rely on it/them

300

Precaution

Something you do to prevent something else from happening


300

Misprescribed

prescribed wrongly 

300

repeat

do something again

300

antifun

not fun

400

Unimportant

not important

400

Preschool

Before school

400

Mistaken

took something wrong

400

recall

try to remember

400

antihero

not a hero

500

Untidy

Not tidy

500

Predetermined

already determined
500

misbehave

behave poorly

500

reveal

Show something to someone

500

antifreeze

not freeze