adjective

1. free from sin, evil, or guilt; specif.,
   1. doing or thinking nothing morally wrong; pure
   2. not guilty of a specific crime or offense; guiltless
   3. free from harmful effect or cause; that does not harm, injure, or corrupt
   4. not malignant; benign an innocent tumor
2. 1. knowing no evil
   2. without guile or cunning; artless; simple
   3. naive
   4. ignorant
3. totally lacking: with of innocent of adornment

Etymology: OFr < L innocens < in-, not + nocens, prp. of nocere, to do wrong to: see necro-

noun

1. a person knowing no evil or sin, such as a child
2. a very naive or simple-minded person