حائطية from the word حائط for example: ساعة حائطية= wall clock there are different meanings of the word مكلف depend on the vowels 1- مُكْلِفْ (muk lif ) means costly for example: the treatment is costly= العلاج مكلف 2- مُكَلًف (mu kallaf ) from the islamic point: The one who is mukallaf is one who is has reached the age of puberty and is of sound mind and this person is accountable for his deeds. or u can say every sane adult. for example: الصلاة واجبة على كل مسلم مكلف Prayer is obligatory upon every sane.adult( which is mu kallaf) Muslim.

very simple wall = حائط something on the wall = حائطية for example wall clock = ساعة حائطية wall picture= صورة حائطية wall board = لوحة حائطية مكلف = when you give someone an assignment to do it. he is Responsible about this assignment for example= الطالب مكلف بالواجبات = the student is Responsible to do his homeworks المسلم مكلف بالصلاة = Muslim is Responsible about his prayer الشرطي مكلف بحماية الناس = the policeman is Responsible to protect people finaly ( مكلف ) is the assignment or job or mission given to do it.

mural= حائطية حائط = wall مُكَلًف = is one who has reached the age of puberty or u can say adult