1. Foundations, principles, or starting points that lack evidence, support, or justification
The argument rests on unfounded bases and lacks credible evidence.
O argumento repousa em bases infundadas e carece de evidências críveis.
2. Assumptions or premises that are not grounded in fact or reason
Their criticism was built on unfounded bases and false premises.
Sua crítica foi construída sobre bases infundadas e premissas falsas.