What does 沉重 (chén zhòng) mean in English?

Card 263HSK 2010 Level 6263/2512
CARD263
PROGRESS10%
沉重
chén zhòng
heavy; hard; serious; critical
Click to reveal
← Previous↑ DeckNext →

Reveal: Click/Space/Enter/↑↓/w/s/j/k•Navigate: ←→/h/l/a/d