un-

not; opposite

i.e: uncover, unlock, unsafe

re-

again; back

i.e.: rewrite, reread, return

in-, im-, ir-, i-

not; into

i.e.: incorrect, insert, 

inexpensive, illigal, irregular,

 inablilty

dis-

not, away, apart, negative

i.e.: disagree, discomfort, 

discontent, distrust

en-, em-

cause to

i.e.: enjoy, endure, enlighten, 

entail

non-

not

i.e.: nonsense, nonverbal, 

nonstick, nonspecific

in-, im-

 in, into, not

i.e.: invade, implant, imperfect, immoral, inedible, incapable

over-

too much

i.e.: overload, overdo, overact, overboard, overdose

mis-

wrongly

i.e.: misjudge, misinterpret, 

misguided, mismatch, misplace

sub-

under

i.e.: submarine, subtext, 

substandard, subversive, 

substitute

pre-

before

i.e.: preview, pretest, prevent, preplan

inter-

between, among

i.e.: interstate, international, 

intermission, intermingle, 

interface

fore-

before

i.e.: foreshadow, foresight, 

foreseeable, forecast, 

foreground

de-, dis-

opposite of, not

i.e.: detour,dehydrated, 

decaffinated, discord, 

discomfort, disengage

trans-

across; move between

i.e.: transatlantic, transcend, 

transfer, transact, transport

super-

above

i.e.: supersonic, superstar, 

supernatural, superstore

semi-

half

i.e.: semicircle, semiprecious, 

semicolon, semifinal

anti-

against

i.e.: antifreeze, antithesis, 

antitrust, antidote, antisocial

mid-

middle

i.e.: midterm, Midwest, 

midstream, midway, midnight

under-

too little; not enough

i.e.: underfed, underdog, 

underestimate, underage