not

Examples:

unhelpful (not helpful)

unethical (not ethical)

again, back

Examples:

retell (tell again)

recede (go back)

in-

im-

il-

ir-

not

Examples:

inactive (not active),

impossible (not possible)

illegible (not readable)

irrelevant (not relevant)

away from, apart

Examples:

dislike (not to like)

distant (away)

en-

em-

in, into

Examples:

entangle (tangled in)

entrapped (trapped in)

not

Examples:

nonsense (does not make sense)

nonprofit (not for profit)

wrong, badly

Example:

mistake (to get wrong)

mistreat (treat badly)

one, alone, single

Examples:

monotone (one note)

monologue (speech by one person)

against

Examples:

antifreeze (prevents freezing)

antisocial (opposite of social)

bi-

two

Examples:

bicycle (two wheeled cycle)

binary (twofold)

com-

con-

co-

col-

with, together

Examples:

Combine (to bring together)

contact (to touch together)

Co-worker (a colleague)

Collect (to bring together)

away from, down, the opposite of

Examples:

depart (go away from)

decline (turn down)

upon, on top of

Examples:

epitaph (writing upon tombstones)

epilogue (speech at the end)

between, among

Examples:

international (among nations)

interpose (to put between)

bad, ill, wrong

Examples:

malpractice (bad practice)

malfunction (fail to function)

everywhere, all

Examples:

omnipresent (always present)

omnipotent (all powerful)

many

Examples:

polysyllable (many syllables)

polygon (many sides)

after

Examples:

postpone (to do after)

postmortem (after death)

before, earlier than

Examples:

preview (earlier viewing)

prehistoric (before written history)

preface (statement written before an article/book)

under, less than

Examples:

submarine (under water)

subliminal (below the level of consciousness)

over, above, greater

Examples:

superstar (greater than other stars)

superimpose (to put over something else)

across

Examples:

transcontinental (across the continent)

transverse (to lie or go across)

un-

uni-

one

Examples:

unidirectional (having one direction)

unanimous (sharing one view)

unilateral (having one side)

not

Examples:

uninterested (not interested)

unhelpful (not helpful)

unethical (not ethical)