Synonyms for «primary reason»

principal prime major secondary main chief leading important first fundamental basic original essential foremost central ultimate pure key public underlying whole initial good real core general strong sole top proper simple second different huge big possible several common driving medical great true additional various worthy single dominant national strategic

purpose rationale motive motivation factor justification objective explanation causes argument goal decision problem priority motivator aim issue responsibility question concern part advantage rule strategy idea role force way basis point importance mission objection need benefit principle job number focus appeal lot task intent emphasis consideration interest use thing challenge