| informal | (adjective) not formal | - |
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| (adjective) used of spoken and written language | - |
| (adjective) having or fostering a warm or friendly and informal atmosphere | Synonyms: cosy, cozy, intimate |
| (adjective) not officially recognized or controlled | Synonyms: loose |
| informational | (adjective) relating to or having the nature of information | - |
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| informative | (adjective) providing or conveying information | Synonyms: informatory |
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| (adjective) tending to increase knowledge or dissipate ignorance | Synonyms: enlightening, illuminating |
| (adjective) serving to instruct or enlighten or inform | Synonyms: instructive |
| informatory | (adjective) providing or conveying information | Synonyms: informative |
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| informed | (adjective) having much knowledge or education | - |
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| reinforced | (adjective) (used of soaps or cleaning agents) having a substance (an abrasive or filler) added to increase effectiveness | Synonyms: built |
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| (adjective) given added strength or support | Synonyms: strengthened |
| uninformative | (adjective) lacking information | - |
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| uninformed | (adjective) not informed; lacking in knowledge or information | - |
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