The term 'ALL TOO FALLIBLE' can be broken down into two crossword solutions: HUMAN (5 letters). The phrase 'all too fallible' is used to describe the HUMAN condition, which is that humans are imperfect and make mistakes. This phrase implies that humans are not infallible, and that they are prone to making errors. The solution 'HUMAN' is a fitting answer to this phrase, as it emphasizes the fact that humans are the ones who are all too fallible.