Formal:
* Lanky: This implies a slender, tall build with long limbs.
* Leggy: This is a more common and direct way to describe someone with long legs.
* Striding: This describes someone who walks with long, purposeful steps, which might be due to long legs.
Informal:
* Long-legged: This is the most straightforward option.
* Tall and slender: This emphasizes both height and a slim frame.
* Gangly: This suggests awkwardness or clumsiness, but can also be a way to describe someone with long limbs.
* Spindly: This word suggests thin and elongated limbs, which could be associated with long legs.
The best adjective to use depends on the context and the tone you want to convey.