The term 'be petty' can be defined as to be overly concerned with minor details or to be excessively critical. This term can be expressed in two crossword solutions: CAVIL (5 letters) and NITPICK (7 letters). CAVIL is defined as to raise trivial objections, while NITPICK is defined as to find fault with minor details. Both terms are used to describe someone who is overly concerned with minor details or excessively critical.