The expression "ised necessary" can be replaced by numerous synonyms depending on the context. Some possible alternatives include "required," "compelled," "obliged," "needed," "demanded," "mandated," "called for," "essential," and "vital." Other synonyms may include "crucial," "indispensable," "imperative," "pressing," "requisite," and "urgent." The choice of synonym will depend on the tone and register of the text, as well as the specific meaning and emphasis needed in the sentence. It's always helpful to have a range of synonyms and antonyms in your vocabulary to help you express yourself more accurately and effectively in writing and speech.