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| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | influential; authoritative |
| Synonyms: | accomplishing, achieving, adequate, binding, capable, conclusive, decisive, determinative, effecting, effective, efficacious, efficient, forcible, fulfilling, in force, lawful, legal, licit, potent, powerful, practicable, productive, qualified, serviceable, sound, strong, successful, telling, useful, valid, virtuous, workable |
| Notes: | effective means 'having a (desired) result or effect,' effectual is 'succeeding in producing a desired result or effect,' and efficacious means the same as effectual as well as 'serving as an effective solution or remedy' |
| Antonyms: | impotent, incapable, ineffectual, unproductive, unsuccessful, useless, weak |
| Main Entry: | effective |
| Part of Speech: | adjective |
| Definition: | productive, persuasive |
| Synonyms: | able, active, adequate, capable, cogent, compelling, competent, convincing, direct, effectual, efficacious, efficient, emphatic, energetic, forceful, forcible, having lead in pencil, impressive, live, moving, on the ball, operative, playing hardball, potent, powerful, powerhouse, practical, producing, resultant, serviceable, serving, sound, striking, sufficient, telling, trenchant, useful, valid, virtuous, wicked*, yielding |
| Notes: | effective means 'having a (desired) result or effect,' effectual is 'succeeding in producing a desired result or effect,' and efficacious means the same as effectual as well as 'serving as an effective solution or remedy' |
| Antonyms: | fruitless, impotent, incapable, ineffective, unproductive, useless, weak |
* = informal/non-formal usage
| Main Entry: | efficacious |
| Part of Speech: | adjective |
| Definition: | efficient, productive |
| Synonyms: | active, adequate, capable, competent, effective, effectual, energetic, influential, operative, potent, powerful, puissant, serviceable, strong, successful, useful, virtuous |
| Notes: | effective means 'having a (desired) result or effect,' effectual is 'succeeding in producing a desired result or effect,' and efficacious means the same as effectual as well as 'serving as an effective solution or remedy' if something is efficacious, it is able to produce the desired result; efficacy means the power to produce effects |
| Antonyms: | incapable, inefficacious, inefficient, unproductive, unsuccessful, useless |
| Main Entry: | efficient |
| Part of Speech: | adjective |
| Definition: | adept, effective |
| Synonyms: | able, accomplished, active, adapted, adequate, apt, businesslike, capable, clever, competent, conducive, decisive, deft, dynamic, economic, economical, effectual, efficacious, energetic, equal to, experienced, expert, familiar with, fitted, good at, good for, handy, masterly, organized, potent, powerful, practiced, productive, proficient, profitable, qualified, ready, saving, shrewd, skilled, skillful, systematic, talented, tough, useful, valuable, virtuous, well-organized |
| Antonyms: | helpless, impotent, incompetent, ineffective, inefficient, powerless, unable, weak |
| Main Entry: | expeditious |
| Part of Speech: | adjective |
| Definition: | immediate, speedy |
| Synonyms: | active, alert, breakneck, brisk, diligent, effective, effectual, efficient, fast, fleet, hasty, instant, nimble, prompt, punctual, quick, rapid, ready, swift |
| Antonyms: | pokey, retarded, slow |
| Main Entry: | helpful |
| Part of Speech: | adjective |
| Definition: | beneficial, beneficent |
| Synonyms: | accessible, accommodating, advantageous, applicable, benevolent, bettering, caring, conducive, considerate, constructive, contributive, convenient, cooperative, crucial, effectual, efficacious, essential, favorable, fortunate, friendly, good for, important, improving, instrumental, invaluable, kind, neighborly, operative, practical, pragmatic, productive, profitable, serendipitous, serviceable, significant, suitable, supportive, symbiotic, sympathetic, timely, usable, useful, utilitarian, valuable |
| Antonyms: | disadvantageous, harmful, hurtful, injurious, unconstructive, unhelpful, useless, worthless |
| Main Entry: | high-powered |
| Part of Speech: | adjective |
| Definition: | powerful |
| Synonyms: | authoritarian, authoritative, commanding, controlling, dominant, dynamic, effective, effectual, forceful, forcible, in control, in the saddle, influential, mighty, potent, robust, ruling, strong, supreme, weighty |
| Main Entry: | infallible |
| Part of Speech: | adjective |
| Definition: | unerring, dependable |
| Synonyms: | acceptable, accurate, agreeable, apodictic, authoritative, certain, correct, effective, effectual, efficacious, efficient, exact, faultless, flawless, foolproof, handy, helpful, impeccable, incontrovertible, inerrable, inerrant, omniscient, perfect, positive, reliable, satisfactory, satisfying, sure, surefire, true, trustworthy, unbeatable, undeceivable, unfailing, unimpeachable, unquestionable, useful |
| Antonyms: | erring, fallible, faulty, imperfect |
| Main Entry: | live |
| Part of Speech: | adjective |
| Definition: | energetic, vigorous |
| Synonyms: | active, alert, brisk, burning, controversial, current, dynamic, earnest, effective, effectual, efficacious, efficient, functioning, hot*, lively, operative, pertinent, pressing, prevalent, running, topical, unsettled, vital, vivid, working |
| Antonyms: | apathetic, dispirited, inactive, lethargic |
* = informal/non-formal usage
Roget's 21st Century Thesaurus, Third Edition
Copyright © 2013 by the Philip Lief Group.
Cite This Source
Roget's 21st Century Thesaurus, Third Edition
Copyright © 2013 by the Philip Lief Group.
Cite This Source
Copyright © 2013 Dictionary.com, LLC. All rights reserved.
