Hard to define
Obscure and hard to define are semantically related. In some cases you can use "Obscure" instead an adjective phrase "Hard to define".
Obscure
Obscure adjective - Having an often intentionally veiled or uncertain meaning.
Hard to define and obscure are semantically related. You can use "Hard to define" instead an adjective "Obscure".
Cite this Source
Obscure and Hard to define. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/hard_to_define/obscure
Hard to define & Obscure. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/hard_to_define/obscure>.
Obscure or Hard to define. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/hard_to_define/obscure.