| complex | (adjective) complicated in structure; consisting of interconnected parts | - |
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| (adjective) difficult to analyze or understand | Synonyms: complicated |
| duplex | (adjective) allowing communication in opposite directions simultaneously | - |
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| (adjective) (used technically of a device or process) having two parts | - |
| multiplex | (adjective) having many parts or aspects | - |
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| (adjective) many and varied; having many features or forms | Synonyms: manifold |
| perplexed | (adjective) full of difficulty or confusion or bewilderment | - |
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| perplexing | (adjective) lacking clarity of meaning; causing confusion or perplexity | Synonyms: confusing, puzzling |
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| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| simplex | (adjective) having only one part or element | - |
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| (adjective) allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time | - |
| triplex | (adjective) having three units or components or elements | Synonyms: ternary, treble, triple |
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| unperplexed | (adjective) experiencing no difficulty or confusion or bewilderment | - |
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