The mountain trail became treacherous after the rain, with loose rocks and slick mud threatening every step.
雨后山间小径变得危险，松动的岩石和湿滑的泥土威胁着每一步。
Which choice best defines “treacherous”?
C — Dangerous, unreliable. “treacherous” means dangerous, unreliable.
Which word means “dangerous, unreliable”?
D — treacherous. “treacherous” means dangerous, unreliable.
treacherous — dangerous, unreliable. In Chinese: 危险的，背叛的.
treacherous is pronounced /ˈtretʃərəs/.
The mountain trail became treacherous after the rain, with loose rocks and slick mud threatening every step. (雨后山间小径变得危险，松动的岩石和湿滑的泥土威胁着每一步。)
hazardous, perilous, unreliable — all close in meaning to treacherous (dangerous, unreliable).
safe, trustworthy — each the opposite of treacherous (dangerous, unreliable).
Yes. treacherous is on the SAT Prep Easy list — mid-frequency academic words that do get tested. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
treachery(betrayal)+ous