If you describe someone’s good qualities or behaviour as ~, you mean that they never change.
He had the ~ care and support of Erica, his wife...
He continued to appear in the office with ~ regularity thereafter.
ADJ: usu ADJ n
~ly
He was ~ly polite to customers...
Foreigners ~ly fall in love with the place.
ADV: usu ADV adj, also ADV with v