← Back to toughness
Full Level C1 →
toughness Etymology Atlas
The quality of being strong and able to endure hardship., The quality of being hard to deal with or difficult. Pro
Word
Root
Affix
Tap any word to open its Atlas. Pinch to zoom, drag to pan.
toughness is a Level C1 word — Pro only
Pro unlocks the Etymology Atlas for levels A2–C2 — plus FSRS-5 spaced repetition, mastery tracking, and the activity dashboard.