The child's clinginess makes it difficult for the parents to have any time for themselves.

clinginess 是由动词 cling（黏附、依附）加上后缀 -iness 构成的名词。cling 的意思是"紧紧抓住或依附"，后缀 -iness 表示某种状态或性质。clinginess 合起来表示"过度依赖或黏人的行为或状态"。