The term ignominious describes actions or situations that bring disgrace, humiliation, or shame. The antonym should signify qualities such as dignity and respect.
Analyzing the provided options:
- Valuable: Indicates worth, but not a direct opposite to disgrace.
- Desirable: Refers to something sought after, not an antonym for dishonor.
- Honourable: Directly opposes ignominious, denoting integrity and high moral standing.
- Clever: Pertains to intelligence, unrelated to honor or shame.
Therefore, the antonym of ignominious is honourable.