A topic or matter being discussed or studied.

चर्चा किया जाने वाला विषय

English Usage: The subject of the lecture was quite engaging.

Hindi Usage: व्याख्यान का विषय बहुत रोचक था।

Lacking a subject or a specific topic.

किसी विषय या विशेष विषय की कमी होना

English Usage: The subjectless sentence was difficult to comprehend.

Hindi Usage: विषय विरहित वाक्य को समझना मुश्किल था।