It was an ignominious defeat for the team.

Answer: Option A

Shameful : worthy of or causing shame or disgrace.
Unexpected : not expected or regarded as likely to happen.
Unaccountable : unable to be explained.
Humiliating : making someone feel ashamed and foolish by injuring their dignity and pride.
Ignominious : deserving or causing public disgrace or shame.

Synonym of Ignominious is Shameful