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 wild? It's wild or rough.

Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You learned two kun'yomi readings for this kanji, so here's a mnemonic to help you remember which one to use:

You know who's really wild? Aladdin (あら). He's always doing wild things like overthrowing evil viziers or zipping around the skies on his magic carpet. Yep, no one's wilder than that wily street urchin Aladdin.