Faciendum – Something which is to be done.
Factum – An act or deed.
Facultas probationum non est angustanda – The right of offering proof is not to be narrowed.
Falsa demonstratio non nocet – A false description does not vitiate.
Fatetur facinus qui judicium fugit – He who flees judgment confesses his guilt.
Felix qui potuit rerum cognoscere causas – Happy is he who has been able to understand the causes of things.
Felonia implicatur in qualibet proditione – Felony is implied in every treason.
Festinatio justitiae est noverca infortunii – The hurrying of justice is the stepmother of misfortune.
Fictio cedit veritati; fictio juris non est, ubi veritas – Fiction yields to truth. Where truth is, fiction of law does not exist.
Fides servanda est – Good faith is to be preserved.
Fieri facias (abreviated fi. fa.) – That you cause to be made.
Filiatio non potest probari – Filiation cannot be proved.
Firmior et potentior est operatio legis quam dispositio hominis – The operation of law is firmer and more powerful than the will of man.
Forma legalis forma essentialis est – Legal form is essential form.
Fortior est custodia legis quam hominis – The custody of the law is stronger than that of man.
Fractionem diei non recipit lex – The law does not regard a fraction of a day.
Fraus est celare fraudem – It is a fraud to conceal a fraud.
Fraus est odiosa et non praesumenda – Fraud is odious and is not to be presumed.
Fraus et jus nunquam cohabitant – Fraud and justice never dwell together.
Fructus naturales – Vegetation which grows naturally without cultivation.
Frustra probatur quod probatum non relevat – That is proved in vain which when proved is not relevant.
Furor contrahi matrimonium non sinit, quia consensus opus est – Insanity prevents marriage from being contracted because consent is needed.