Strong
い adjective
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 strong? It's also strong.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
If you wanna be strong, you need to be able to use two yo-yos (つよ) at a time. Like, as weapons. And I don't mean with two hands. I mean one hand wielding two yo-yos. Now that's strong.
全日本の女子バレーチームは、中々強い
All Japanese women's volleyball teams are strong.
同点だったということは、両方強いチームだったということだ。
The fact that it was a tie means that both teams were strong.
風が強いから、今日は外に出るのはやめた方がいい。
It's very windy today, so it's better not to go out today.