radical

Universal Words adjective, noun adjective [usuallybeforenoun] 1 concerning the most basic and important parts of sth; thorough and complete: the need for radical changes in education * demands for radical reform of the law * radical differences between the sexes 2 new, different and likely to have a great effect: radical ideas * a radical solution to the problem * radical proposals / measures 3 in favour of thorough and complete political or social change: the radical wing of the party * radical politicians / students / writers 4 (AmE, slang) very good radically adverb: The new methods are radically different from the old. * Attitudes have changed radically. noun a person with radical opinions: political / religious radicals