Several years ago when my grandparents were well into their eighties, they were faced with the reality of no longer being able to adequately care for themselves.
2015年12月六级真题（第一套）听力 Section C
They argued that her causal-sounding claims rested on correlational data, and that she had not adequately accounted for other potential causal factors.
2019年12月六级真题（第一套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
足够的；合格的；可用的
If something is adequate, there is enough of it or it is good enough to be used or accepted.