Commonly, adjectives of opposite meaning are formed by adding a prefix such asun, in, ordis.غالباً، والأكثر شيوعاً أن عكس الصفات تتكون بإضافة لواحق مثل un,in, أو disمــــثــــلا ً :
clear – unclear(نظيف – غير نظيف)
important – unimportant(مهم – غير مهم )
predictable – unpredictablebelievable – unbelievable,common – uncommon,aware – unaware,ambiguous – unambiguous,conventional – unconventionalcertain – uncertaindefinite – indefinite,correct – incorrect,comparable – incomparable,complete – incomplete,evitable – inevitable,expensive – inexpensiveable – disable,assemble – disassemble,content – discontent,similar – dissimilar