unhappiness noun
ADJ. considerable, deep, great | general, widespread | personal
VERB + UNHAPPINESS feel | express | cause, lead to Bottling up your anger can only lead to unhappiness.
PREP. ~ about He expressed his unhappiness about the arrangements. | ~ at the great unhappiness she felt at having to leave the town | ~ with his deep unhappiness with the situation
You can also check other dicts: unhappiness (English, 中文解释 ), wordnet sense, Collins Definition