The bottom support of a structure.

A fundamental principle or groundwork of something.

मूलभूत सिद्धांत

English Usage: The base of his argument was flawed.

Hindi Usage: उसके तर्क का आधार कमजोर था।

Of low quality; contemptible.

निम्न गुणवत्ता का

English Usage: His base motives were revealed.

Hindi Usage: उसकी निम्न गुणवत्ता वाले इरादे उजागर हुए।