WordNet sense 1 (a person who lacks knowledge of evil):

inexperienced person

WordNet sense 2 (free from sin):

sinless, impeccant

WordNet sense 3 (morally excellent):

virtuous

WordNet sense 4 (lacking in sophistication or worldliness):

ingenuous

WordNet sense 5 (marked by or showing unaffected simplicity and lack of guile or worldly experience):

naive

WordNet sense 6 (free of guilt; not subject to blame):

blameless

WordNet sense 7 (freed from any question of guilt):

clear

WordNet sense 8 (free from evil or guilt):

guiltless, clean-handed

WordNet sense 9 (not knowledgeable about something specified):

unacquainted

WordNet sense 10 (not informed; lacking in knowledge or information):

uninformed

WordNet sense 11 (lacking intent or capacity to injure):

innocuous

WordNet sense 12 (not causing or capable of causing harm):

harmless

WordNet sense 13 (completely wanting or lacking):

barren, destitute, devoid

WordNet sense 14 (holding or containing nothing):

empty

WordNet sense 15 (not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead):

unconscious