1. Antonyms for Astringencies include blandness, weaknesses, plainness, mildness, banality, triteness, tastelessnesses, insipidness, jejuneness and lifelessness

2. There are many synonyms of Blandness which include Drabness, Dreariness, Flatness, Innocuousness, Insipidity, Insipidness, Lifelessness, Pallidness, Vapidity, Jejuneness, Vapidness, Colorlessness, Boringness, etc.