| effaceable | (adjective) capable of being effaced | Synonyms: erasable |
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| effected | (adjective) settled securely and unconditionally | Synonyms: accomplished, established |
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| effective | (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effectual, efficacious |
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| (adjective) existing in fact; not theoretical; real | - |
| (adjective) able to accomplish a purpose; functioning effectively | Synonyms: efficient |
| (adjective) works well as a means or remedy | - |
| (adjective) ready for service | - |
| (adjective) exerting force or influence | Synonyms: good, in effect, in force |
| effectual | (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effective, efficacious |
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| (adjective) having legal efficacy or force | Synonyms: legal, sound |
| effeminate | (adjective) having unsuitable feminine qualities | Synonyms: cissy, emasculate, epicene, sissified, sissy, sissyish |
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| efferent | (adjective) of nerves and nerve impulses; conveying information away from the CNS | Synonyms: motorial |
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| effervescent | (adjective) (of a liquid) giving off bubbles | - |
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| (adjective) used of wines and waters; charged naturally or artificially with carbon dioxide | Synonyms: sparkling |
| (adjective) marked by high spirits or excitement | Synonyms: bubbling, frothy, scintillating, sparkly |
| effervescing | (adjective) emitting or filled with bubbles as from carbonation or fermentation | Synonyms: bubbling, bubbly, foaming, foamy, frothy, spumy |
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| effete | (adjective) deprived of vigor and the ability to be effective | - |
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| (adjective) affected, overrefined, and effeminate | - |
| efficacious | (adjective) marked by qualities giving the power to produce an intended effect | - |
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| (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effective, effectual |
| efficient | (adjective) being effective without wasting time or effort or expense | - |
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| (adjective) able to accomplish a purpose; functioning effectively | Synonyms: effective |
| efflorescent | (adjective) when the bud, or buds, on a plant are bursting into flower | Synonyms: abloom |
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| effluent | (adjective) that is flowing outward | Synonyms: outflowing |
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| effortful | (adjective) requiring great physical effort | - |
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| effortless | (adjective) requiring or apparently requiring no effort | - |
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| (adjective) not showing effort or strain | Synonyms: casual |
| effulgent | (adjective) radiating or as if radiating light | Synonyms: beaming, beamy, radiant, refulgent |
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| effusive | (adjective) extravagantly demonstrative | Synonyms: gushing, gushy |
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| (adjective) uttered with unrestrained enthusiasm | Synonyms: burbling, burbly, gushing |