showing no sympathy or kind treatment synonym cruel毫不憐憫的;無情的;殘忍的 a merciless killer/attack 無情的殺手/攻擊 the merciless heat of the sun 太陽的酷熱 She was subjected to the merciless criticism of her opponents. 她受到對手無情的批評。 It brought relief from the merciless summer heat. 它可以讓人們擺脫夏日的酷熱。