undoubtingly

Adverb

 * 1) Without doubting.
 * 2) * 1659, John Pearson, An Exposition of the Creed, London: J. Williams, 6th edition, 1692, Article VIII, p. 316,
 * But were there nothing, which is already said, demonstrated, there is enough written in the Word of God to assure us of the Deity of the Holy Ghost, to make us undoubtingly believe that the Spirit of God is God.