Sat prefix/suffix

un-

Not; reverse → unassuming = not boastful; modest

in-, im-, il-, ir-

Not → immutable = unable to change

dis-

Opposite; apart; undo → disconnect = separate

a-, an-

Without; not → amoral = unconcerned with morality

anti-

Against → antithesis = direct opposite

counter-

Against; opposite → counterargument = argument against another

mis-

Wrongly → misconstrue = understand incorrectly

mal-

Bad; badly → malfunction = work improperly

bene-

Good; well → benevolent = kind and helpful

pre-

Before → prejudge = judge beforehand

ante-

Before → antecedent = something that came before

post-

After → postwar = after a war

re-

Again; back → reassert = state again

de-

Remove; reverse; reduce → devalue = reduce in value

sub-

Under; below → substandard = below the required quality

super-

Above; beyond → superimpose = place over something

inter-

Between → interdependent = depending on one another

intra-

Within → intramural = within one school or institution

trans-

Across; beyond → transcontinental = across a continent

co-, con-, com-

Together; with → coexist = exist together

ex-

Out; former → exclude = keep out

circum-

Around → circumnavigate = travel around

hyper-

Excessive; above normal → hyperactive = excessively active

hypo-

Below normal → hypoactive = less active than normal

mono-

One → monolingual = using one language

poly-

Many → polyglot = person who knows many languages

-able, -ible

Capable of being → discernible = able to be noticed

-less

Without → baseless = without supporting evidence

-ful

Full of; having → resentful = feeling bitterness

-ous

Having a quality → perilous = dangerous

-ive

Having a tendency or quality → evasive = tending to avoid answering directly

-al, -ic

Relating to → cultural = relating to culture

-ity, -ness

State or quality → ambiguity = the state of having multiple possible meanings

-tion, -sion

Action, process, or result → expansion = the process of growing

-ment

Action, result, or state → concealment = the act of hiding

-ance, -ence

State, quality, or action → persistence = continuing despite difficulty

-ify

Make; cause to become → clarify = make clear

-ize

Make; become → stabilize = make or become stable

-ist

Person who practices or supports something → botanist = scientist who studies plants

-ism

Belief, system, or practice → idealism = belief in or pursuit of ideals