This is the 4322nd most frequent Japanese word.
刺さ
"刺さ" means "to stick" or "to pierce."
刺さっている indicates being stuck or embedded in a static state.
木に枝が刺さっている。
A branch is stuck in the tree.
刺さった implies the intensity and focus of attention.
多くの視線が彼女に刺さった。
Many gazes were fixed upon her.
刺さった conveys emotional impact, as if piercing one's feelings.