1. superlative form of green; most green in color
2. superlative form of green; most environmentally friendly or sustainable
Usage: informal
3. superlative form of green; most inexperienced or naive
Usage: informal

Examples

• The greeniest vegetables in the market were the fresh spinach and kale.
• Their company has the greeniest practices of any manufacturer in the industry.
• He was the greeniest member of the team, having just started last week.
• The greeniest part of the forest is where the most sunlight reaches the plants.
• She chose the greeniest option for her new car to reduce her carbon footprint.
• The greeniest recruits always need the most training and supervision.