1. Marked by excessive enthusiasm for and intense devotion to a cause or idea
   - fanatic, fanatical, rabid

See also: passionate

• monograph
• monogynic
• monogynist
• monogynous
• monogyny
• monohull
• monohybrid
• monohybrid cross
• monohydrate
• monoicous
• monolatry
• monolingual
• monolingually
• monolith
• monolithic
• monologist
• monologue
• monologuise
• monologuize
• monomania
• monomaniac
• monomaniacal
• monomer
• monometallic
• monometer