1. (a.) Mandatory; forced; required\.

2. (a.) Obligatory; enjoined by authority; necessary; due to compulsion.

absolute binding choiceless coactive compelling compulsatory compulsive conclusive constraining decisive decretory dictated driving entailed exigent final hard-and-fast imperative imperious importunate imposed inevitable involuntary irresistible irrevocable mandated mandatory must necessary necessitous obligatory peremptory prescript prescriptive pressing required restraining ultimate urgent without appeal without choice