1. having the most spines or thorns; most prickly
Usage: superlative form of spiny
2. most difficult or troublesome to handle
Usage: figurative use

Examples

• The rose bush in the corner was the spiniest of all the plants in the garden.
• Sea urchins are among the spiniest creatures in the ocean.
• This cactus variety is the spiniest species we grow here.
• The spiniest issue in the negotiation was the budget allocation.
• Of all the problems we face, this is the spiniest one to resolve.
• The spiniest part of the hiking trail required protective gear.