ぎくりとする (translations)→ alarmed start stop
はっと (translations)→ abruptly alarm alert automatically dead hurriedly jolt quick quickly sharply short sudden suddenly swiftly
はっとする (translations)→ know surprise
思いがけない (translations)→ abrupt accidental alarming curious disproportionately extraordinary piece strange surprised unbelievable unexpected unheralded unsuspected
茫然と (translations)→ blankly fascinated stunned stupefied