16
tenacious(adjective, strong, unyielding, sticky, retention)
6
recollective
5
retaining(adjective, spongy, retention)
4
mindful
4
clinging
3
long
2
holding
2
keeping
2
persistent
2
pressure-tight(adjective, tight, proof, impervious, hermetic)
2
impermeable(adjective, tight, proof, impervious, hermetic)
2
tight(adjective, proof, impervious, hermetic)
2
waterproof(adjective, tight, proof, impervious, hermetic)
1
acquisitive
1
aware
1
cohesive
1
grasping
1
strong
1
air-locked(adjective, tight, proof, impervious, hermetic)
1
air-proof(adjective, tight, proof, impervious, hermetic)
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APASmart Define. (2015). retentive thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/retentive/thesaurus/synonyms
ChicagoSmart Define. 2015. "retentive thesaurus" https://smartdefine.org/retentive/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, retentive thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/retentive/thesaurus/synonyms>.
MLASmart Define. "retentive thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/retentive/thesaurus/synonyms>