← Back to treacherous
Full Level C2 →
treacherous Etymology Atlas
Dangerous and unpredictable, especially because hidden hazards are hard to see., Likely to betray someone's trust; not loyal. Pro
Word
Root
Affix
Tap any word to open its Atlas. Pinch to zoom, drag to pan.
treacherous is a Level C2 word — Pro only
Pro unlocks the Etymology Atlas for levels A2–C2 — plus FSRS-5 spaced repetition, mastery tracking, and the activity dashboard.