76 entries under firm topic. ×

45
stubborn(adjective, obstinate, characteristic, quality, stubbornness)
31
refractory(adjective, control, order, tough, difficulty)
28
obstinate(adjective, control, order, strong, hard)
27
recalcitrant(adjective, control, order, tough)
26
inflexible(adjective, strong, hard, tough, rough)
22
headstrong(adjective, strong, hard, tough, rough)
22
unyielding(adjective, appearance, hard, tough, rough)
18
adamant(adjective, hard, tough, determined)
17
contumacious(adjective, tough, determined, negative)
16
obdurate(adjective, tough, difficult, violent)
14
dogged(adjective, appearance, tough, terrible)
14
insubordinate(adjective, tough, negative, hostile)
14
perverse(adjective, mean, tough, difficulty)
13
rebellious(adjective, tough, negative, hostile)
13
rigid(adjective, tough, persistent, obstinate)
13
uncompromising(adjective, hard, tough, rough)
12
immovable(adjective, hard, difficult, determined)
12
mulish(adjective, tough, difficult, indifferent)
12
unbending(adjective, hard, tough, rough)
11
pigheaded(adjective, tough, deliberate, determined)
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APASmart Define. (2015). intractable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/intractable/thesaurus/synonyms
ChicagoSmart Define. 2015. "intractable thesaurus" https://smartdefine.org/intractable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, intractable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/intractable/thesaurus/synonyms>.
MLASmart Define. "intractable thesaurus" 24 June 2015. Web. 23 September 2026. <https://smartdefine.org/intractable/thesaurus/synonyms>