Harmless
WordNet
adjective
(1) Not threatening to life or health; not malignant
"A benign tumor is usually harmless"
(2) Not causing or capable of causing harm
"Harmless bacteria"
"Rendered the bomb harmless"
(3) Not injurious to physical or mental health
(4) Unlikely to harm or disturb anyone
"Harmless old man"
(5) Not producing any toxic effects