in-
en-
dis-
a-/ab-/an-
pre-
100

inactive

not moving, dormant

100

enable

make something possible

100

disobey

not follow an order

100

amoral

no concern for right or wrong

100

preview

an advance showing of something

200

insecure

not confident, uncertain

200

encourage

to give support

200

disagree

to have a different opinion

200

abnormal

acting in an unusual way

200

preheat

to warm the oven up before baking or cooking 

300

indifferent

no interest or concern

300

enrich

to improve the quality or value of something

300

disrespect

to treat someone poorly

300

anemia

blood condition

300

prepay

pay in advance

400

incompatible

not able to work together

400

enlighten

to give someone greater knowledge about a subject

400

dismantle

to take apart 

400

apathy

lack of interest or concern

400

precaution

a measure taken to prevent something dangerous from happening

500

insufficent

not enough

500

endanger

to put someone at risk or harm

500

dislocate

to put out of place or move a bone from its joint

500

abduct

to take someone away by force 

500

prehistoric 

the time before written records