This is a word that even high level students don't understand immediately. An example sentence is: "My car is very reliable because I never have any problems with it". The translation of "reliable" is "fiable".
This word is very useful in the car industry, for example, because car manufacturers are continuously trying to make their cars more reliable!!
Hope that helps!
Soy el director de Daniel Smith + Partners. Tengo más de 10 años de experiencia enseñando inglés a españoles.