1. Antonyms for Blamable include blameless, faultless, impeccable, irreproachable, inculpable, innocent, perfect, unblemished, flawless and stainless

2. Antonyms for Blameful include praiseworthy, blameless, faultless, innocent, irreproachable, impeccable, inculpable, clean, guiltless and immune

3. Antonyms for Blameworthy include blameless, faultless, impeccable, innocent, irreproachable, inculpable, praiseworthy, perfect, unblemished and flawless

4. Apart from similar words, there are always opposite words in dictionary too, the opposite words for Blamable are Blameless, Inculpable and Innocent.