Igneous
Igneous adjective - Produced by the action of fire or intense heat.
Stiff as a board and igneous are semantically related. In some cases you can use "Stiff as a board" instead an adjective "Igneous".
Stiff as a board
Igneous and stiff as a board are semantically related. Sometimes you can use "Igneous" instead an adjective phrase "Stiff as a board".
Cite this Source
Stiff as a board and Igneous. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/igneous/stiff_as_a_board
Igneous & Stiff as a board. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/igneous/stiff_as_a_board>.
Stiff as a board or Igneous. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/igneous/stiff_as_a_board.
