Synonyms of required

1 Syllable

right, set, bound, due, just

2 Syllables

urgent, right-hand, binding, bullseye, rightful, righthand, condign, vital, needed, needful

3 Syllables

demanded, enforced, obliged, imperious, essential, suitable, deserved, prescribed, called-for, bottom-line, life-or-death

4 Syllables

compulsory, recommended, appropriate, obligated, requisite, bottomline, mandatory, top-priority, necessary, name-of-the-game, coal-and-ice

5 Syllables

compulsatory, obligatory, pre-requisite, imperative, indispensable, unavoidable, prerequisite