partisan

a person who supports a political party or leader, especially in a very enthusiastic and sometimes extreme way

partidario, seguidor político

• be a partisan of somebody/something

Collocations partisan supporter · partisan loyalty

• He is a staunch partisan of the president.

  Es un partidario incondicional del presidente.

a member of an organized group that fights against a country's government or foreign invaders during wartime, often operating behind enemy lines and using guerrilla tactics

partisano, guerrillero

• be a partisan of something

Collocations partisan warfare · partisan activity

• During the war, he became a partisan fighter.

  Durante la guerra, se convirtió en un guerrillero partisano.

showing or influenced by strong personal opinions and beliefs that prevent fair judgment; biased or one-sided

parcial, sesgado

• be partisan

Collocations partisan attitude · partisan viewpoint

• The report was clearly partisan.

  El informe era claramente parcial.