The term 'Surly and Forbidding' can be summed up by the crossword solution 'CRUSTY, ' which is a six-letter word. CRUSTY is an adjective that describes someone or something as having a rough, unfriendly, and unapproachable exterior. It is often used to describe people who are grumpy, irritable, and unfriendly. It can also be used to describe things that are old and worn out, such as furniture or clothing.