IPA: /ˌɪrɪˈproʊtʃəbl/
KK: /ɪrɪˈproʊtʃəbl/
This word describes someone or something that is so good or perfect that they cannot be criticized or blamed.
Her irreproachable behavior earned her the respect of her peers.
Irreproachable → It is formed from "in-" (meaning not) and "reproach" (from Latin "reprochare", meaning to blame or criticize) and the suffix "-able" (meaning capable of). The word describes someone who is not capable of being blamed or criticized, hence morally faultless or blameless.
Think of someone who is 'not' ('in-') capable of being 'blamed' ('reproach') — that's why irreproachable means beyond reproach or fault.