Platitudinous: noun: (of a remark or statement) used too often to be interesting or thoughtful; hackneyed.

Source: https://en.oxforddictionaries.com/definition/platitudinous

From: “Quicksand” by Nella Larsen, Chapter 23 – Page 151

“Her husband was still, as he had always been, deferentially kind and incredulously proud of her-and verbally encouraging. Helga tried not to see that he had rather lost any personal interest in her, except for the short spaces between the times when she was preparing for or recovering from childbirth. She shut her eyes to the fact that his encouragement had become a little platitudinous, limited mostly to “The Lord will look out for you,”…”

The word platitudinous is used to describe Helga Crane’s feeling towards her husband’s words. Her husband has repeated his words so much that she is growing somewhat tired of them.