The term 'crumbum' is a slang term used to describe someone who is lazy, shiftless, and generally of low moral character. The two crossword solutions for this term are 'LOUSE' (5 letters) and 'HEEL' (4 letters). Both terms are used to describe someone who is untrustworthy or morally questionable. A LOUSE is a small, parasitic insect that feeds on the blood of humans and other animals, and is often used as a metaphor for someone who is untrustworthy or a freeloader. A HEEL is someone who is considered to be morally reprehensible or untrustworthy, and is often used to describe someone who is selfish or unkind.