à toute épreuve (méthode, rigide, personne)

foolproof (a) (méthode)

infallible (a) (méthode)

ironclad (a) (rigide)

concrete (a) (rigide)

rigid (a) (rigide)

inflexible (a) (rigide)

unswerving (a) (personne)

infallibile (a) (méthode)

sicuro (a) (méthode)

saldo (a) [m.] (personne)

fermo (a) (personne)

rigido (a) (rigide)

ferreo (a) (rigide)

inflessibile (a) (rigide)

inviolabile (a) (rigide)

incrollabile (a) (personne)

infalible (a) (méthode)

a toda prueba (a) (méthode)

rígido (a) (rigide)

riguroso (a) (rigide)

inflexible (a) (rigide)

inquebrantable (a) (personne)

narrensicher (a) (méthode)

absolut sicher (a) (méthode)

eisern (a) (rigide)

streng (a) (rigide)

unerschütterlich (a) (personne)

unbeirrbar (a) (personne)

onfeilbaar (a) (méthode)

onbuigzaam (a) (rigide)

hard (a) (rigide)

waterdicht (a) (rigide)

streng (a) [m.] (rigide)

onwankelbaar (a) (personne)

onwrikbaar (a) (personne)

idiotsäker (a) (méthode)

ofelbar (a) (méthode)

sträng (a) (rigide)

orubblig (a) (rigide)

rigorös (a) (rigide)

orubblig (a) (personne)

osviklig (a) (personne)

seguro (a) [m.] (méthode)

infalível (a) (méthode)

perfeito (a) (méthode)

duro (a) [m.] (rigide)

inflexível (a) (rigide)

rígido (a) (rigide)

constante (a) [f.] (personne)

firme (a) (personne)

inabalável (a) (personne)