1. superlative form of heavy: having the greatest weight
2. superlative form of heavy: most intense, severe, or difficult

Examples

• This is the heaviest box in the storage room.
• The elephant is the heaviest land animal.
• We experienced the heaviest rainfall of the year yesterday.
• The heaviest traffic occurs during rush hour.
• She carried the heaviest workload on the team.
• The heaviest fighting took place near the border.
• This is the heaviest metal in the periodic table.