Any process that restricts, stops or prevents a cell from specifying into a cardioblast. A cardioblast is a cardiac precursor cell. It is a cell that has been committed to a cardiac fate, but will undergo more cell division rather than terminally differentiating.
Synonyms:
exact_synonym:
down regulation of cardioblast cell fate specification; downregulation of cardioblast cell fate specification; suppression of cardioblast cell fate