1
great bellied
1
habitual(fixed, persistent, hardened, lasting, confirmed)
1
immortal
1
immutable(calm, strong, solid, steady, substantial)
1
impressed
1
imprinted
1
in for the long haul(expression, idiom, permanent, long-term, lifelong)
1
inbuilt
1
incessant(permanent, long-term, lifelong)
1
incorrigible
1
inculcated
1
incurable(fixed, persistent, continuous, hardened, lasting)
1
indelible(fixed, permanent, long-term, lifelong, deep-seated)
1
indelibly impressed
1
indwelling
1
inexhaustible(permanent, long-term, lifelong)
1
inexpungible(permanent, long-term, lifelong)
1
infixed
1
ingrown
1
intense
10 years ago|3.8k views|share |citing 
APASmart Define. (2016). deep-rooted thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/deep-rooted/thesaurus/synonyms
ChicagoSmart Define. 2016. "deep-rooted thesaurus" https://smartdefine.org/deep-rooted/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, deep-rooted thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/deep-rooted/thesaurus/synonyms>.
MLASmart Define. "deep-rooted thesaurus" 26 February 2016. Web. 26 September 2026. <https://smartdefine.org/deep-rooted/thesaurus/synonyms>