An adjectival suffix is a type of word ending that is added to a noun or verb to create an adjective. The crossword solutions for the term 'adjectival suffix' are OUS (3 letters), ENT (3 letters), ESE (3 letters), INE (3 letters), ISH (3 letters), and ICAL (4 letters). These suffixes can be used to describe a variety of qualities, such as size, shape, color, origin, and purpose. For example, the suffix -ous can be used to describe something as being full of a certain quality, while the suffix -ish can be used to describe something as being somewhat related to a certain quality.