副词，意为"坚定地、毫不动摇地"，形容以坚决、忠诚、不变的态度去做某事或持有某种立场。
She steadfastly refused to give up her dream of becoming a doctor.
她坚定地拒绝放弃成为医生的梦想。
Despite years of criticism and isolation, he steadfastly maintained his belief in the theory, and his persistence was ultimately rewarded when new evidence proved him right.
尽管多年来饱受批评和孤立，他仍坚定不移地坚持自己对该理论的信念，而他的执着最终在新证据证明他正确时得到了回报。
steadfastly 由形容词 steadfast 加副词后缀 -ly 构成。steadfast 源自古英语 stedefst，由 stede（地方、位置）和 fst（牢固的、固定的）组合而成，原义为"固定在某处的、不动的"，后引申为"坚定的、忠贞不渝的"。这个词在英语中有超过一千年的历史，是最古老的英语复合词之一。
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