pre-
un-
re-
-less
-ness
100
school before kindergarten

preschool

100

not fair

unfair

100

read again

reread

100

without hope

hopeless

100

being lonely

loneliness

200

see before 

preview
200

not sure

unsure

200

test again

retest

200
without help
helpless
200

being happy

happiness

300

this is added to the beginning of a word

prefix

300

not equal

unequal

300

run again

rerun

300

without fear

fearless

300

being kind

kindness

400

Set before

preset

400

not even

uneven

400

see again

review

400

without shelter

homeless

400

being thoughtful

thoughtfulness

500

Judge before knowing someone

prejudge

500

not kind

unkind
500

replay

play again

500

without end

endless

500

being bold

boldness