-in,-im,-il,-ir-
re-
pre-
mid-
non-
100

Impatient 

not patient 

100

redo

to do something again
100

prefix

a combination of letters at the beginning of a word that changes the meaning of the word

100

midpoint

a point in the middle of a line

100

none

not one

200

Illegal

not legal

200

remake

to make something again

200

pre-calculus

The math class you take before calculus

200

midnight

the middle of the night (12am)

200

nonissue

not an issue

300

Immoral 

Not moral; bad 

300

reclassify

to classify again; give something a new name/title

300

prehistoric

"before historic"; very ancient

300

midlife

The middle of one's life (about ages 40-65)

300

nonadjustable

not adjustable; cannot be adjusted

400

Irreplaceable 

not replaceable 

400

relocate

to locate again; to move

400

prerequisite 

Something you are required to have before taking the next step

400

midafternoon

The middle of the afternoon (about 2pm)

400

nonbeliever

someone who does not believe

500

inaccessible 

not accessible

500

reinstitutionalize

To place an incarcerated individual in prison again

500

predisposed

to be disposed to do something in advance (because of genetics of environment)

500

midair

In the air

500

nonabrasive

not abrasive