The term 'One Not To Be Trusted' can be summed up by the crossword solutions of POLECAT (7 letters), SNEAK (5 letters), SERPENT (7 letters), MOLE (4 letters), RAT (3 letters), and LIAR (4 letters). Polecats are members of the weasel family, known for their sly and mischievous behavior. Sneaks are people who act in a secretive or underhanded way. Serpents are often seen as symbols of deceit and treachery. Moles are small mammals that live underground and are known for their secretive nature. Rats are rodents that are often associated with filth and disease. Liars are people who intentionally deceive others. All of these creatures and people are associated with untrustworthiness and dishonesty, making them fitting solutions for the term 'One Not To Be Trusted'.