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Definition of questionless : 1. Beyond a question or doubt; doubtless; certainly.
2. Unquestioning; incurious.

Synonyms:

indisputable, certain, unquestionable

Usage examples:

• But the light shone at last, and guided his wavering footsteps, And at last came the voice, imperative, questionless, certain. - "The Complete Poetical Works of Henry Wadsworth Longfellow", Henry Wadsworth Longfellow.
• Questionless, there is no perfecter endowment in man than political virtue, and of this Economics is commonly esteemed not the least part; for a city, which is a collection of private households, grows into a stable commonwealth by the private means of prosperous citizens that compose it. - "Plutarch-Lives-of-the-noble-Grecians-and-Romans", Clough, Arthur Hugh.
• All the officers, sadly enough, concluded that there was not the least show of any hopes of preservation, but that they were all dead men, and that upon the return of the tide the ship would questionless be dashed in pieces. - "A Journal of the Swedish Embassy in the Years 1653 and 1654, Vol II.", Bulstrode Whitelocke.