mostly

used for saying that something is true or happens most of the time, but not always

principalmente, en su mayoría

• mostly + adj

Collocations mostly sunny days · mostly quiet evenings

• The weather is mostly fine in summer.

  El clima es en su mayoría agradable en verano.

used for saying that something should be done or is the best way to do it, but other ways are possible too

preferiblemente, principalmente

• mostly + adj

Collocations mostly avoid · mostly stick to

• You should mostly avoid sugar.

  Deberías principalmente evitar el azúcar.