135 entries under adjective topic. ×

14
obligatory(sound, certain, true, significant)
13
necessary(sound, essential, inexorable, required)
9
essential(significant, basic, vital, necessary)
9
tying(verb, fastening, restrictive, restraining)
8
compulsory(sound, certain, true, significant)
8
inevitable(certain, expected, predictable, required)
8
mandatory(set, significant, affected, essential)
8
required(significant, essential, basic, vital)
7
confining(verb, severe, harsh, stiff)
7
imperative(significant, essential, basic, vital)
7
valid(sound, right, reasonable, severe)
6
constraining(verb, required, obligatory, restraining)
6
requisite(significant, essential, basic, vital)
6
stringent(sound, reasonable, severe, rational)
5
constricting(verb, restraining)
5
legal(sound, reasonable, rational)
4
authoritative(sound, reasonable, rational, unconditional)
4
compelling(verb, sound, reasonable, severe)
4
dutiful(obedient, well-behaved)
4
effectual(influential, authoritative)
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APASmart Define. (2015). binding thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/binding/thesaurus/synonyms
ChicagoSmart Define. 2015. "binding thesaurus" https://smartdefine.org/binding/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, binding thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/binding/thesaurus/synonyms>.
MLASmart Define. "binding thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/binding/thesaurus/synonyms>