这一问题是深刻的，触及深层问题。

The problem is ___profound, reaching deep issues.

这位哲学家的观点深刻而富有洞察力。

The philosopher's views were ___profound and insightful.

她对孩子的爱是如此深沉，无法用言语表达。

Her ___profound love for her child is beyond words.

她的演讲给我留下了深刻的印象。

Her speech left a ___profound impression on me.