1 spotless, stainless, unblemished, pure, clean, untarnished, unsullied, unsoiled, snow-white, spick and span, dapper, spruce; tidy, neat:
Each morning he donned an immaculate uniform.
2 pure, chaste, innocent, virginal, virtuous, vestal, pristine, undefiled, untainted, unspoiled, unblemished, stainless, unadulterated:
He remained convinced of his wife's immaculate reputation.
3 faultless, flawless, perfect, errorless, impeccable:
His essay on Gibbon is an example of immaculate scholarship.