My attitude, however, was entirely too grown-up-by which I mean cerebral, unspontaneous, and a bit grim.
CNN: The hobby that helped me take flight
unspontaneous:
un- +? spontaneous
英汉双解词典包含3185865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。