1. superlative form of grouted; most filled or sealed with grout (a thin mortar used between tiles or in masonry)
Usage: technical; construction/masonry context
2. superlative form of grouty; most resembling or containing grout; most thick or muddy in consistency
Usage: informal; rare

Examples

• The groutiest sections of the tile floor were where water had seeped in over time.
• After the renovation, the bathroom had the groutiest finish of any room in the house.
• The contractor ensured the groutiest joints were properly sealed to prevent leaks.
• This mixture is the groutiest of all the samples we tested today.