Synonyms for Benign (same or very similar meaning)
WordNet sense 1 (having or showing a tender and considerate and helpful nature; used especially of persons and their behavior):
kindWordNet sense 2 (pleasant and agreeable):
kindlyWordNet sense 3 (not threatening to life or health; not malignant):
harmlessWordNet sense 4 (pleasant and beneficial in nature or influence):
benignantFrom the ODE community, based on WordNetadd/edit