Take the following example: a spiritually shallow person growing aware of his own futility in the course of engaging in the endless reflections imposed by science.

句中growing aware of ... 做后置定语修饰person。但是growing我查了词典只有形容词词性，而aware是形容词，感觉growing是副词语法上才说得通。我查了原文，此句引述正确，来自《The Idea of the University》 by Karl Jaspers。请问这里growing是什么语法现象?