| abstruse | (adjective) difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge | Synonyms: deep, recondite |
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| awestruck | (adjective) having or showing a feeling of mixed reverence and respect and wonder and dread | Synonyms: awed, awestricken |
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| constructive | (adjective) constructing or tending to construct or improve or promote development | - |
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| (adjective) emphasizing what is laudable or hopeful or to the good | - |
| deconstructionist | (adjective) of or concerned with the philosophical theory of literature known as deconstructionism | - |
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| destructible | (adjective) easily destroyed | - |
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| destructive | (adjective) causing destruction or much damage | - |
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| diestrual | (adjective) (of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity | Synonyms: diestrous, dioestrous, dioestrual |
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| dioestrual | (adjective) (of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity | Synonyms: diestrous, diestrual, dioestrous |
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| distrustful | (adjective) having or showing distrust | - |
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| dumbstruck | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstricken, dumfounded, flabbergasted, stupefied, thunderstruck |
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| indestructible | (adjective) not easily destroyed | - |
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| (adjective) very long lasting | Synonyms: durable, perdurable, undestroyable |
| instructional | (adjective) of or relating to or used in instruction | - |
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| instructive | (adjective) serving to instruct or enlighten or inform | Synonyms: informative |
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| instrumental | (adjective) relating to or designed for or performed on musical instruments | - |
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| (adjective) serving or acting as a means or aid | Synonyms: implemental, subservient |
| menstrual | (adjective) of or relating to menstruation or the menses | Synonyms: catamenial |
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| mistrustful | (adjective) openly distrustful and unwilling to confide | Synonyms: leery, suspicious, untrusting, wary |
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| moonstruck | (adjective) insane and believed to be affected by the phases of the moon | Synonyms: lunatic |
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| nonstructural | (adjective) not structural | - |
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| obstructed | (adjective) shut off to passage or view or hindered from action | - |
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| obstructive | (adjective) preventing movement | Synonyms: clogging, hindering, impeding |
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| overstrung | (adjective) too tightly strung | - |
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| (adjective) being in a tense state | Synonyms: edgy, high-strung, highly strung, jittery, jumpy, nervy, restive, uptight |
| premenstrual | (adjective) of or relating to or occurring during the time just before menstruation | - |
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| reconstructed | (adjective) adapted to social or economic change | - |
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| reconstructive | (adjective) helping to restore to good condition | Synonyms: rehabilitative |
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| struck | (adjective) (used in combination) affected by something overwhelming | Synonyms: smitten, stricken |
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| structural | (adjective) relating to or having or characterized by structure | - |
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| (adjective) relating to or caused by structure, especially political or economic structure | - |
| (adjective) relating to or concerned with the morphology of plants and animals | Synonyms: morphologic, morphological |
| (adjective) pertaining to geological structure | Synonyms: geomorphologic, geomorphological, morphologic, morphological |
| (adjective) concerned with systematic structure in a particular field of study | - |
| (adjective) affecting or involved in structure or construction | - |
| structured | (adjective) having definite and highly organized structure | - |
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| (adjective) resembling a living organism in organization or development | Synonyms: integrated |
| struggling | (adjective) engaged in a struggle to overcome especially poverty or obscurity | - |
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| strung | (adjective) that is on a string | - |
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| sunstruck | (adjective) lighted by sunlight | Synonyms: sunlit |
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| thunderstruck | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstricken, dumbstruck, dumfounded, flabbergasted, stupefied |
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| unconstructive | (adjective) not constructive | - |
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| uninstructed | (adjective) lacking information or instruction | Synonyms: naive, unenlightened |
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| uninstructive | (adjective) failing to instruct | - |
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| unobstructed | (adjective) free from impediment or obstruction or hindrance | - |
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| unreconstructed | (adjective) adhering to an attitude or position widely held to be outmoded | - |
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| unstructured | (adjective) lacking definite structure or organization | - |
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| (adjective) lacking the system or structure characteristic of living bodies | Synonyms: amorphous |
| unstrung | (adjective) emotionally upset | - |
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