Synonyms for radical

modified

1. Fundamental

   basic, original, primitive, underlying; see fundamental 1, organic.

2. Advocating extreme change

   extremist, revolutionary, fanatical, militant, rabid, insurgent, iconoclastic, advanced, forward, insurrectionary, progressive, revisionist, abolitionist, leftist, communistic, left-wing, uncompromising, intransigent, recalcitrant, mutinous, rebellious, recusant, subversive, seditious, riotous, lawless, ultraconservative, racist, white supremacist, insubordinate, anarchistic, nihilistic, Bolshevistic, Communist, socialist, liberal, immoderate, heretical, freethinking, avant-garde, Jacobinic, ultraist, ultraistic, ultra, red*, pink*; see also fanatical, rebellious 2, revolutionary 1.

   Antonyms conservative*, reformist, gradualist.

3. Thoroughgoing

   extreme, drastic, thorough, complete; see comprehensive, extreme 2. See syn. study at liberal.

noun