Hard shell
Thick as thieves and hard shell are semantically related. In some cases you can use "Thick as thieves" instead an adjective phrase "Hard shell".
Thick as thieves
Hard shell and thick as thieves are semantically related. Sometimes you can use "Hard shell" instead an adjective phrase "Thick as thieves".
Mutual synonyms
Cite this Source
Thick as thieves and Hard shell. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/hard_shell/thick_as_thieves
Hard shell & Thick as thieves. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/hard_shell/thick_as_thieves>.
Thick as thieves or Hard shell. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/hard_shell/thick_as_thieves.
