un
re
co, con, com
im, in
-tion/sion
100

to not tie

untie

100

to push back

repel

100

to stand with

consist

100

to throw in 

inject

100

state of acting

action

200

the opposite of like

unlike

200

to stand again or against

resist

200

to push with, for

compel

200

to not act

inact

200

state of hearing

audition

300

to not hinge

unhinge

300

to carry again

refer

300

to carry with

confer

300
to look into

inspect

300

state of stretching

tension

400

the opposite of "able to"

unable

400

to act again

react

400

to step with; national legislative body  

congress

400

to carry in

infer

400

state of throwing back

rejection

500

the opposite of exploring in the past

unexplored

500

to step back

regress

500

to stretch with

contend

500

to stand in

insist

500

state of coming in; act of inventing something

invention