Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun radical

6 senses of radical

Sense 1
group, radical, chemical group -- ((chemistry) two or more atoms bound together as a single unit and forming part of a molecule)
       => unit, building block -- (a single undivided natural thing occurring in the composition of something else; "units of nucleic acids")

Sense 2
free radical, radical -- (an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule; "in the body free radicals are high-energy particles that ricochet wildly and damage cells")
       => atom -- ((physics and chemistry) the smallest component of an element having the chemical properties of the element)

Sense 3
radical -- (a person who has radical ideas or opinions)
       => person, individual, someone, somebody, mortal, soul -- (a human being; "there was too much for one person to do")

Sense 4
radical -- ((mathematics) a quantity expressed as the root of another quantity)
       => measure, quantity, amount -- (how much there is or how many there are of something that you can quantify)

Sense 5
radical -- (a character conveying the lexical meaning of a logogram)
       => character, grapheme, graphic symbol -- (a written symbol that is used to represent speech; "the Greek alphabet has 24 characters")

Sense 6
root, root word, base, stem, theme, radical -- ((linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem")
       => form, word form, signifier, descriptor -- (the phonological or orthographic sound or appearance of a word that can be used to describe or identify something; "the inflected forms of a word can be represented by a stem and a list of inflections to be attached")

Antonyms of adj radical

4 of 5 senses of radical

Sense 1
extremist, radical, ultra -- ((used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative")

INDIRECT (VIA immoderate) -> moderate -- (being within reasonable or average limits; not excessive or extreme; "moderate prices"; "a moderate income"; "a moderate fine"; "moderate demands"; "a moderate estimate"; "a moderate eater"; "moderate success"; "a kitchen of moderate size"; "the X-ray showed moderate enlargement of the heart")

Sense 2
revolutionary, radical -- (markedly new or introducing radical change; "a revolutionary discovery"; "radical political views")

INDIRECT (VIA new) -> old -- (of long duration; not new; "old tradition"; "old house"; "old wine"; "old country"; "old friendships"; "old money")

Sense 3
radical -- (arising from or going to the root or source; "a radical flaw in the plan")

INDIRECT (VIA basic) -> incidental, incident -- ((sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence; "incidental expenses"; "the road will bring other incidental advantages"; "extra duties incidental to the job"; "labor problems incidental to a rapid expansion"; "confusion incidental to a quick change")

Sense 5
radical (vs. cauline), basal -- (especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem; "basal placentation"; "radical leaves")

cauline (vs. radical) -- (especially of leaves; growing on a stem especially on the upper part of a stem; "cauline leaves")

Similarity of adj radical

5 senses of radical

Sense 1
extremist, radical, ultra -- ((used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative")
       => immoderate (vs. moderate) -- (beyond reasonable limits; "immoderate laughter"; "immoderate spending")

Sense 2
revolutionary, radical -- (markedly new or introducing radical change; "a revolutionary discovery"; "radical political views")
       => new (vs. old) -- (not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered; "a new law"; "new cars"; "a new comet"; "a new friend"; "a new year"; "the New World")

Sense 3
radical -- (arising from or going to the root or source; "a radical flaw in the plan")
       => basic (vs. incidental) -- (pertaining to or constituting a base or basis; "a basic fact"; "the basic ingredients"; "basic changes in public opinion occur because of changes in priorities")

Sense 4
radical -- (of or relating to or constituting a linguistic root; "a radical verb form")

Sense 5
radical (vs. cauline), basal -- (especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem; "basal placentation"; "radical leaves")