Translation of "Chiefly" in Spanish

Matter is composed chiefly of nothing.

La materia está compuesta principalmente de nada.

The accident was caused chiefly by the unpredictable weather.

El accidente fue causado principalmente por el clima variable.

- His trouble was chiefly mental.
- His illness was mainly psychological.

Su enfermedad era algo mental principalmente.

"The Parisian police," he said, "are exceedingly able in their way. They are persevering, ingenious, cunning, and thoroughly versed in the knowledge which their duties seem chiefly to demand."

"La policía parisina," él dijo, "son excesivamente buenos en su labor. Son perseverantes, ingeniosos, astutos y exhaustivamente versados en el conocimiento, más allá de lo que sus deberes parecen exigirles."