Lex nil facit frnstra
Defined in 2 dictionaries — Cyclopedic (1922), Black's (1910)
The Cyclopedic Law Dictionary
Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
NIL JUBETy^ frustra. The law does nothing and commands nothing in vain. 3 Bulst. 279; Jenk. Cent. Cas. 17.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The law does nothing in vain. Jenk. Cent p. 12, case 19; Broom, Max. 252; 1 Ventr. 417.