adjective

underlying

underlying, fundamental, basic

What is the underlying cause of the problem?

What is the underlying cause of the problem?

There is an underlying assumption in his argument.

There is an underlying assumption in his argument.

an underlying ((noun)) describing the fundamental nature of (sth.) The underlying theme of the book is love.

Synonyms: fundamental, basic, essential; Antonyms: superficial, obvious

From 'under' + 'lying' (from the verb 'to lie'). It literally means 'lying under' something, referring to what is fundamental but not obvious.

Picture the foundation of a house 'lying under' it. It's the real, often unseen, support or cause.

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