| perpendicular | (adjective) intersecting at or forming right angles | - |
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| (adjective) at right angles to the plane of the horizon or a base line | Synonyms: vertical |
| (adjective) so steep as to be nearly vertical | - |
| perpetual | (adjective) uninterrupted in time and indefinitely long continuing | Synonyms: ceaseless, constant, incessant, never-ending, unceasing, unremitting |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eonian, eternal, everlasting, unceasing, unending |
| 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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| superpatriotic | (adjective) fanatically patriotic | Synonyms: chauvinistic, flag-waving, jingoistic, nationalistic, ultranationalistic |
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| superposable | (adjective) coinciding exactly when superimposed | Synonyms: identical |
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| unperplexed | (adjective) experiencing no difficulty or confusion or bewilderment | - |
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