1Not involving introspection or deliberation; not reflected (on or upon).
2Of light, heat, etc.: not returned by reflection.
Early 17th century (in an earlier sense). From un- + reflected.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。