The term 'Slightest Concern' can be summarized as a phrase that implies a lack of worry or anxiety. It is often used to describe a situation in which there is no need to be concerned, even if the issue at hand is minor. The crossword solution for this term is 'HOOT', which is an expression of joy or amusement. It is often used to express approval or delight, and can also be used to show that something is not a cause for concern.