Expensive
Both words in one sentence
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H&K was working on the cook-off issue via special (expensive) propellant that needs a significantly higher temperature to ignite, but it's unclear how far they'd gotten when the G11 project was cancelled.
Source: Rare Guns -
The reason for the green color is still a bit unclear note Partly because a strong storm is hard to reproduce in the lab, and it is hard to measure them directly without it smashing your expensive equipment.
Source: Wind is Green
Cite this Source
Unclear and Expensive. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/expensive/unclear
Expensive & Unclear. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/expensive/unclear>.
Unclear or Expensive. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/expensive/unclear.
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