Obligatory

Adjective

 * 1) Imposing obligation, morally or legally; binding: an obligatory promise.
 * 2) Requiring a matter or obligation.

Antonyms

 * optional

Related terms

 * obligate
 * obligated
 * obligation
 * obligational
 * obligato
 * obligatorily
 * oblige
 * obligee
 * obliger
 * obliging
 * obligingly
 * obligingness
 * obligor

Adverbs for Obligatory
dreadfully; rigorously; inescapably; legally; morally; financially; sadly; stringently; rigidly; unfortunately; sternly; inflexibly; appallingly; strictly.

Thesaurus
absolute, binding, choiceless, compulsory, conclusive, de rigueur, decisive, decretory, demanded, dictated, entailed, essential, exigent, final, hard-and-fast, imperative, imperious, importunate, imposed, incumbent, indispensable, inevitable, involuntary, irrevocable, mandated, mandatory, must, necessary, necessitous, peremptory, prescript, prescriptive, required, requisite, ultimate, urgent, without appeal, without choice

Pronunciation
/α'bligətəri, -tri/,