controversial

Latin controversia (“controversy”) + -al; see controversy.

• (UK) IPA^(key): /kɒn.tɹə.ˈvɜː.ʃəl/, /kɒn.tɹə.ˈvɜː.sjəl/
• (US) IPA^(key): /kɑn.tɹə.ˈvɝ.ʃəl/, /kɑn.tɹə.ˈvɝ.si.əl/

controversial (comparative more controversial, superlative most controversial)

1. Arousing controversy—a debate or discussion of opposing opinions.
   • (Can we date this quote?) Macaulay:

     Whole libraries of controversial books.

• Nouns often used with "controversial": topic, subject, work, author, method, etc.

• contentious
• contested

• uncontroversial
• noncontroversial
• incontrovertible

• controversialness

• controversialist
• controversiality
• controversy
• controvert
• controverter
• controvertible

• disputatious
• polemical
• disputable
• controvertible
• debatable

• controversial in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• controversial in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

controversial (plural controversiales)

1. controversial
   • 2015 December, “Estamos en el comienzo de un reexamen del capitalismo”, in El Pais (Uruguay)‎:

     Esto comienza con los acuerdos de (protección de) inversión que han sido controversiales por cerca de veinte años.

     (please add an English translation of this quote)