dis
un
in
ir
100

someone who behaves in an untrustworthy or fraudulent way.

dishonest

100

open by using a key; use a password to access something

unlock

100

not right

incorrect

100

someone who doesn't think enough or worry about the possible results of what they do

irresponsible

200

a physical or mental condition that limits a person's movements, senses, or activities.

disability

200

without a job; out of work

unemployed

200

not having all the necessary or appropriate parts.

incomplete

200

contrary to the rules or to that which is normal or established. Verbs in the past, for example

irregular

300

slight pain. make (someone) feel uneasy, anxious, or embarrassed.

discomfort

300

not completely confident or sure of something.

uncertain

300

having a relaxed, friendly, or unofficial style, manner, or nature.

informal

300

not connected with or not important to something.

irrelevant

400

a failure of two things to relate

disconnect

400

sick, ill, indisposed

unwell

400

lacking the quality or quantity required; insufficient for a purpose.

inadequate

400

too special, unusual, or valuable to get another

irreplaceable