IPA: /ˈθɔːrniər/
KK: /ˈθɔrnɪər/
More difficult or complicated than something else, often referring to a situation or problem that has many challenges or obstacles.
The negotiations became thornier as both sides refused to compromise.
Comparative: thornier
Superlative: thorniest
Thornier → It is formed from "thorn" (from Old English "þorn", meaning a sharp, pointed growth on a plant) and "-ier" (a comparative suffix indicating more of a quality). The word "thornier" means having more thorns or being more prickly than something else.
Think of a 'thorn' as a sharp point on a plant, and when something is 'thornier', it means it has more of those sharp points, making it pricklier.