Il- opposite/not illegal/illegible
Im- opposite/not impossible/immodest
In- opposite/not incorrect/insensitive
Inter- between international
Ir- opposite/not irrelevant/irresponsible
Non- not non-smoker/non-alcoholic
Over- too much overweight
Un- opposite unfair/unkind
Under- too little underweight
Negative prefixes
un- unmagnetized
in- incomplete
im- impossible
il- illegal
ir - irregular, irrelevant
non- not connected with non-programmable
mis- misdirect
mal- bad, wrong malfunction
dis- opposite feeling disagree
opposite action disconnect
anti- against antiglare
de- reduce, reverse demagnetize, decode
under- too little underestimate