This is the 5130th most frequent Japanese word.
辛かっ
"辛かっ" is not a standalone word but appears to be part of "辛かった," which means "was spicy" or "was painful/difficult," depending on the context.
辛かった is used to describe the difficulty and physical or emotional challenge experienced during the practice.
昨日の練習はとても辛かったです。
Yesterday's practice was very tough.
辛かった is used to describe the level of spiciness of the dish.
この料理は辛かったけれど美味しかったです。
This dish was spicy but delicious.
辛かった is used to describe an emotional pain or distress experienced after watching the movie.