My friend’s room is spacious and clean.
That French person has a wide forehead.
Wow, this place is huge!
This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of wide? It's also wide.
The reading for this word is the same as the reading you learned in the kanji section: ひろ, making this ひろい.