41 entries under obligatory topic. ×

2
prerequisite(adjective, significant, essential, basic, vital)
1
all-important(adjective, significant, serious, essential, basic)
1
chief(adjective, big, important, significant, substantial)
1
de rigueur(expression, adjective, significant, essential, basic)
1
decisive(adjective, big, significant, substantial, large)
1
expedient(adjective, significant, essential, basic, vital)
1
fundamental(adjective, important, significant, essential, critical)
1
incumbent on(expression, adjective, significant, essential, basic)
1
name of game(expression, adjective, idiom, significant, essential)
1
needed(adjective, significant, essential, basic, vital)
1
needful(adjective, significant, essential, basic, vital)
1
principal(adjective, big, important, significant, substantial)
1
quintessential(adjective, significant, essential, basic, vital)
1
specified(adjective, significant, essential, basic, vital)
1
unavoidable(adjective, significant, essential, basic, vital)
1
wanted(adjective, important, significant, serious, essential)
0
basic(adjective, significant, essential, vital, required)
0
bottom-line(adjective, significant, essential, basic, vital)
0
cardinal(adjective, significant, essential, basic, vital)
0
elementary(adjective, significant, essential, basic, vital)
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APASmart Define. (2016). pressing thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/pressing/thesaurus/synonyms
ChicagoSmart Define. 2016. "pressing thesaurus" https://smartdefine.org/pressing/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, pressing thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/pressing/thesaurus/synonyms>.
MLASmart Define. "pressing thesaurus" 19 February 2016. Web. 25 September 2026. <https://smartdefine.org/pressing/thesaurus/synonyms>