-able/-ible
* Indicates the ability to be done or acted upon.
* read (verb) + -able = readable (adjective)
* break (verb) + -able = breakable (adjective)
* access (verb) + -ible = accessible (adjective)
-al
* Indicates a connection or relation to something.
* nation (noun) + -al = national (adjective)
* music (noun) + -al = musical (adjective)
* tradition (noun) + -al = traditional (adjective)
-ful
* Indicates fullness or abundance of something.
* care (noun) + -ful = careful (adjective)
* thank (verb) + -ful = thankful (adjective)
* power (noun) + -ful = powerful (adjective)
-ic
* Indicates a connection to something.
* atom (noun) + -ic = atomic (adjective)
* hero (noun) + -ic = heroic (adjective)
* economy (noun) + -ic = economic (adjective)
-ish
* Indicates a resemblance or similarity.
* child (noun) + -ish = childish (adjective)
* red (adjective) + -ish = reddish (adjective)
* book (noun) + -ish = bookish (adjective)
-ive
* Indicates a tendency or quality of something.
* act (verb) + -ive = active (adjective)
* create (verb) + -ive = creative (adjective)
* protect (verb) + -ive = protective (adjective)
-ous
* Indicates a state or quality of something.
* danger (noun) + -ous = dangerous (adjective)
* courage (noun) + -ous = courageous (adjective)
* humor (noun) + -ous = humorous (adjective)
-y
* Indicates a state or quality of something.
* rain (noun) + -y = rainy (adjective)
* wind (noun) + -y = windy (adjective)
* sun (noun) + -y = sunny (adjective)
-less
* Indicates the absence or lack of something.
* hope (noun) + -less = hopeless (adjective)
* care (noun) + -less = careless (adjective)
* fear (noun) + -less = fearless (adjective)
These are just some of the common suffixes that create adjectives. There are many others, and some words can be formed with multiple suffixes.