deep · profound

I was deeply impressed by the scenery.

You can only bury these deeply in your heart.

The culture of the Chinese zodiac is deeply rooted in people's lives, language and literature.

In a sunny spot stood a pleasant old farm-house close by a deep river, and from the house down to the water side grew great burdock leaves, so high, that under the tallest of them a little child could stand upright. The spot was as wild as the centre of a thick wood. In this snug retreat sat a duck on her nest, watching for her young brood to hatch; she was beginning to get tired of her task, for the little ones were a long time coming out of their shells, and she seldom had any visitors.

His speech impressed us very much.