adj.私生的，非婚生的，不符合规定的，非法的
n.没有合法身分的人

Their marriage was declared illegitimate by the court due to the fact that they were closely related.
他们的婚姻因亲近血缘关系被法院宣布为非法。
The king's youngest son, born out of wedlock, was considered illegitimate and thus had no claim to the throne.
国王最小的儿子是非婚生的，因此被认为是非法的，没有继承王位的权利。
The government deemed those elections illegitimate because of widespread voting irregularities.
政府认为那些选举因广泛的投票不规范而非法。
He accused the regime of being illegitimate, citing human rights abuses and lack of democratic processes.
他指责该政权非法，列举了人权侵犯和缺乏民主程序。
The child, born of an extramarital affair, faced social stigma as an illegitimate offspring.
那个婚外情所生的孩子作为非婚生子女面临着社会的耻辱。
The rebel group refused to recognize the newly formed government, deeming it illegitimate.
反对派团体拒绝承认新成立的政府，认为其不合法。
Her claim to the inheritance was challenged as illegitimate since she had been adopted.
她对遗产的声称因为她是被收养的而被质疑为非法。
The regime's hold on power was seen as increasingly illegitimate by the international community.
该政权对权力的掌控越来越被国际社会视为非法。
The document was deemed illegitimate as it bore a forged signature.
该文件因有伪造的签名而被视为非法。
The opposition argued that the election results were illegitimate due to voter suppression tactics.
反对派认为，由于压制选民的策略，选举结果是非法的。