D defs.my
Entry 1 sense Webster, 1913

Impeccable

/ĭmˌ-pĕk'-əb-əl/ · Im·pec·ca·ble · IPA /ɪmˈpɛkəbəl/
01 a. Not liable to sin; exempt from the possibility of doing wrong.
  1. 1.
    Not liable to sin; exempt from the possibility of doing wrong.
    “God is infallible, impeccable, and absolutely perfect.” — P. Skelton.