Antonyms of adj hurtful

2 senses of hurtful

Sense 1
hurtful -- (causing hurt; "her hurtful unconsidered words")

INDIRECT (VIA unkind) -> kind -- (having or showing a tender and considerate and helpful nature; used especially of persons and their behavior; "kind to sick patients"; "a kind master"; "kind words showing understanding and sympathy"; "thanked her for her kind letter")

Sense 2
deleterious, hurtful, injurious -- (harmful to living things; "deleterious chemical additives")

INDIRECT (VIA harmful) -> harmless -- (not causing or capable of causing harm; "harmless bacteria"; "rendered the bomb harmless")

Similarity of adj hurtful

2 senses of hurtful

Sense 1
hurtful -- (causing hurt; "her hurtful unconsidered words")
       => unkind (vs. kind) -- (lacking kindness; "a thoughtless and unkind remark"; "the unkindest cut of all")

Sense 2
deleterious, hurtful, injurious -- (harmful to living things; "deleterious chemical additives")
       => harmful (vs. harmless) -- (causing or capable of causing harm; "too much sun is harmful to the skin"; "harmful effects of smoking")