Inadecuado vs. inapropiado
These two adjectives both translate to "unsuitable" or "inappropriate," but they are used in different contexts. Generally, inadecuado refers to something that is functionally or technically wrong for a purpose, while inapropiado refers to behavior or items that are socially or morally unacceptable.
Inadecuado
B2This word describes something that does not fit a specific goal, purpose, or physical requirement. It implies insufficiency, incorrectness, or a lack of utility. If a tool, a time, or a method implies a practical mismatch, you use inadecuado.
Este destornillador es inadecuado para este tipo de tornillo.
(This screwdriver is unsuitable for this type of screw.)
Una dieta alta en grasas es inadecuada para tu salud cardiovascular.
(A high-fat diet is unsuitable for your cardiovascular health.)
El edificio fue declarado inadecuado para ser habitado debido a las grietas.
(The building was declared unfit to be inhabited due to the cracks.)
Llamaste en un momento inadecuado porque estaba en una reunión.
(You called at an unsuitable time because I was in a meeting.)
Los fondos asignados resultaron inadecuados para completar el proyecto.
(The allocated funds turned out to be inadequate to complete the project.)
Inapropiado
B2This word describes something that violates social norms, etiquette, or moral standards. It implies that an action, comment, or appearance is rude, offensive, or out of place within a specific social setting. If it involves manners or rules of conduct, you use inapropiado.
Fue inapropiado hacer chistes durante el funeral.
(It was inappropriate to make jokes during the funeral.)
El uso de lenguaje vulgar es inapropiado en el salón de clases.
(The use of vulgar language is inappropriate in the classroom.)
Su vestimenta era inapropiada para una boda formal.
(Her attire was inappropriate for a formal wedding.)
Hizo un comentario inapropiado sobre la vida personal de su jefe.
(He made an inappropriate comment about his boss's personal life.)
Es inapropiado preguntar a una mujer su edad en esta cultura.
(It is inappropriate to ask a woman her age in this culture.)
Summary
The main distinction lies between function versus etiquette. Use inadecuado when something doesn't work well, doesn't fit physically, or is insufficient for a task (a wrong tool or bad timing). Use inapropiado when something is socially awkward, rude, offensive, or breaks the rules of behavior (bad manners or offensive jokes).