「Adjectives and Adverbs」
Adjectives have polite forms. These include not only simple, polite expressions, but honorific and humble expressions as well.
To make a polite expression
The prefix o- or go- added to an adjective expresses politeness. Basically o- is used for Japanese-origin words and go- for Chinese-origin words. All i-adjectives are Japanese in origin, while most na-adjectives are Chinese in origin. Some Chinese-origin na-adjectives may take o- rather than go-.
Na-adjectives that use o-:
Hope this helps!
°˖ ✧◝(○ ヮ ○)◜✧˖ °こゆうきあいはら°˖ ✧◝(○ ヮ ○)◜✧˖ °