Bad service is a term used to describe a situation in which a customer receives inadequate or unsatisfactory service. The three crossword solutions for the term are LET (3 letters), FAULT (5 letters) and DOUBLEFAULT (11 letters). LET is an abbreviation of the verb 'letting' which means to allow or permit something to happen. FAULT is an error or mistake that is made, usually resulting in a negative outcome. DOUBLEFAULT is a situation in which two mistakes are made consecutively, often leading to a more serious consequence.