Meanings
adjectiverainfast (comparative more rainfast, superlative most rainfast)
comparative more rainfast · superlative most rainfast · alternative rain-fast
- That is not washed off by the rain
Origin
From rain + fast (“fixed firmly”, adjective, as in fast asleep).
Full word history & related roots →Cite this entry
APA
rainfast. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/rainfast
MLA
“rainfast.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/rainfast. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “rainfast,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/rainfast.
Source: rainfast on Wiktionary, CC BY-SA 4.0.