PREFIX
in- in, into, not

ROOT
anim - spirit, life
cred - believe
equ - equal, fair

SUFFIX
-ate - to make, to act
-ence - state, quality, act
-ible - able to be
-ity - state, quality, act
-ulous - having the quality of

WORDS AND DEFINITIONS
animate - to give spirit, life, motion, or activity to
equanimity - calm temperament; evenness of temper
credence - belief; acceptance as true or valid
incredible - disbelieving; not believing
incredulous - too extraordinary and impossible to believe