An adjective suffix is a type of affix that is added to the end of a word to modify its meaning. The crossword solutions for the term adjective suffix include INE (3 letters), IBLE (4 letters), FUL (3 letters), EAN (3 letters), ENT (3 letters), EST (3 letters), IAL (3 letters), IVE (3 letters), ORY (3 letters), TIC (3 letters), ETIC (4 letters), ICAL (4 letters), ITIC (4 letters), and ULAR (4 letters). These suffixes can be used to create adjectives from nouns, verbs, and other adjectives. For example, adding -ful to the noun 'CARE' creates the adjective 'CAREFUL, ' and adding -ive to the verb 'ACT' creates the adjective 'ACTIVE.'