fanatical

Definitions

Filled with or expressing excessive and uncritical zeal.

Characterized by an extreme, often irrational, enthusiasm for a cause or belief.

Examples

The politician had a fanatical following of supporters who would defend his every word.

She possessed a fanatical devotion to her fitness routine, never missing a single day of training.

Synonyms

zealous obsessive extremist frenzied passionate dogmatic rabid

Antonyms

apathetic indifferent moderate dispassionate unenthusiastic composed balanced