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Adjectives modify a noun or pronoun. Descriptive adjectives describe the noun.

Examples of descriptive adjectives [in bold]:

yellow banana, tall pole, wide door, deep ditch, flowing river, honest man, stormy sky

 

The suffixes below, when added to a word, will make that word into an adjective.
Suffixes, source, meaning, and example:

-able -ible -from -abilis (Latin) means-that can be - portable, audible

-al from -alis (Latin) means of, like, having the nature of - ornamental

-ate from atus (Latin) means of or having to do with - colligate

-ful from -ful (Old English) means full of - playful

-ive from -ivus (Latin) means of or having to do with - massive

-ous from osus (Latin) means full of - joyous

Here's a list of common adjective endings (suffixes):

-able, -al, -ant, -ary, -ed, -en, -ent, -ful, -ic, -ish, -less, -ous, -some, -y