prosperest

Verb

prosper (third-person singular simple present prospers, present participle prospering, simple past and past participle prospered)

1. (intransitive) To be successful; to succeed; to be fortunate or prosperous; to thrive; to make gain.
   • Yet his passion for her had grown fiercer than ever, and he swore to himself that he would win her back from her phantasies. She, one may believe, was ready enough to listen. As she walked with him by the Sker water his words were like musick to her ears, and Alison within doors laughed to herself...1902, John Buchan, The Outgoing of the Tide
2. (intransitive) To grow; to increase.
   • And his master saw that the Lord was with him, and that the Lord made all that he did to prosper in his hand.1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Genesis 39:3
3. (obsolete, transitive) To favor; to render successful.
   • Prosper thou our handiwork.1549 March 7, Thomas Cranmer [et al.], compilers, The Booke of the Common Prayer and Administration of the Sacramentes, […], London: […] Edowardi Whitchurche […], →OCLC

See all 4 meanings of prosper