thoughtlessly
憖 centers on acting without careful thought: doing something thoughtlessly, rashly, or in a careless manner.
憖 is a rare character whose historical development is uncertain. It visually combines 猌 (a dog-related component) over 心 (heart/mind), but the exact origin and how it came to mean 'thoughtlessly' is unclear.
Imagine a dog (猌) sitting on top of your heart (心), making you act thoughtlessly and without restraint, like a careless animal.
For ギン, picture a thoughtless person grinning (ギン) while the dog on their heart makes them act rashly: grin -> ギン.