perspicacious
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1. Of clear or penetrating sight; clear-sighted. (Often passing into
2.) arch.

    2. Of persons, their faculties, etc.: Of clear or penetrating mental
vision or discernment.

    ¶3. erron. Clear, translucent, perspicuous. rare.

    Hence perspi{sm}caciously adv., with clear vision, clearly; perspi{sm}caciousness.