“苦痛地”常见英文表达可以是 painfully 。它作副词时，有“痛苦地；令人痛苦地；艰难地”等含义，能体现出因痛苦而呈现出的状态或动作方式。例如：
He walked painfully, dragging his injured leg.（他痛苦地走着，拖着受伤的腿。）
She winced painfully as the needle went in.（针扎进去时，她痛苦地皱起了眉头。 ）