Tough; stiff; hard — physically strong or rigid and not easily bent or broken.
この木はこわくて釘が打ちにくい。
This wood is so hard that it's difficult to drive nails into it.
古い包丁だが、刃がこわくてよく切れる。
It's an old knife, but the blade is very hard and cuts well.
Inflexible; obstinate; stubborn — describing a person or attitude that is rigid and unwilling to change.
彼は自分の考えにこだわりすぎて、こわいところがある。
He clings to his own ideas too much and can be stubborn.
会社のやり方がこわくて、なかなか改善されない。
The company's practices are inflexible and don't get improved easily.
Tired; worn out — Hokkaido dialect for being exhausted.
今日は一日中動き回って、もうこわくなった。
I was on the move all day and I'm worn out now.
山道を歩いて、みんなこわくて休憩した。
We walked the mountain trail and everyone was exhausted, so we rested.