Green’s Dictionary of Slang

whole-footed adj.

also whole-soled
[SE whole-footed, treading with one’s whole foot, not just the toes]

unreserved, frank, free and easy.

Phila. Age Jan. 14 n.p.: A noble, whole-soled gentleman, whose liberality will earn him the thanks of his countrymen and the gratitude of coming generations.
[US]Schele De Vere Americanisms 648: Whole footed, whole-hearted, and whole-souled, are popular cant terms, used with a profusion and want of discrimination which has utterly destroyed their original meaning. Any devising man, who invites a crowd to ‘drinks all around’ is instantly praised as a ‘whole-footed man.’.
[UK]Partridge DSUE (1984) 1335/2: from 1730: s. > ca. 1760.