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Adjective
Example: “We need a credible source.”
Synonyms: reliable, believable
Antonyms: unreliable
Example: “The schedule proved unfeasible.”
Synonyms: impractical, impossible
Antonyms: feasible, practical
Example: “No leader is infallible.”
Synonyms: faultless, unerring
Antonyms: fallible, mistaken
Example: “She seemed impervious to criticism.”
Synonyms: unaffected, immune
Antonyms: vulnerable, sensitive
Example: “It was such an engrossing novel that I forgot the time.”
Synonyms: absorbing, captivating
Antonyms: boring, dull
Example: “The chair has an adjustable backrest.”
Synonyms: flexible, modifiable
Antonyms: fixed, rigid
Noun
Example: “Lemon juice is acidic.”
Synonyms: sour, chemical acid
Antonyms: alkaline, sweet
Example: “She is able to speak three languages.”
Synonyms: capable
Antonyms: unable
Example: “The region is known for its unsurpassed natural beauty.”
Synonyms: unmatched, peerless
Antonyms: inferior, surpassed
Example: “The decision may have irrevocable consequences.”
Synonyms: irreversible, final
Antonyms: revocable, reversible
Example: “In a crisis, even skilled workers may be treated as dispensable.”
Synonyms: nonessential, replaceable
Antonyms: essential, indispensable
Example: “We considered every conceivable option before deciding.”
Synonyms: imaginable, possible
Antonyms: inconceivable, impossible
Example: “There was an inexplicable drop in performance overnight.”
Synonyms: mysterious
Antonyms: explainable
Example: “His muscles felt stiff.”
Synonyms: rigid
Antonyms: flexible
Example: “Smoking is harmful.”
Synonyms: dangerous
Antonyms: safe
Example: “The proposal remains controversial.”
Synonyms: debatable, contentious
Antonyms: uncontroversial
Example: “The tool is useless now.”
Synonyms: pointless
Antonyms: useful
Example: “This task is impossible.”
Synonyms: unreal
Antonyms: possible
Example: “It is possible to finish today.”
Synonyms: feasible
Antonyms: impossible
Example: “The proposal is viable only if costs are reduced.”
/ɪˈfektɪv/
Example: “This method is very effective.”
Synonyms: good, impressive, competent
Antonyms: ineffectual, ineffective, uneffective
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