What does the term 'intriguing' most closely mean?

The term 'intriguing' most closely means 'extremely interesting and fascinating.' When something is described as intriguing, it implies that it captures attention and provokes curiosity. This quality often suggests an element of mystery or depth that invites further exploration or thought. For instance, an intriguing book might have a compelling plot that keeps readers eager to find out what happens next.

The other options do not align with this meaning. Descriptions like 'ordinary and unremarkable' or 'dull and boring' convey a lack of interest or excitement, which contradicts the essence of what makes something intriguing. Similarly, while 'complex and difficult' can sometimes draw interest, it does not inherently carry the same connotation of fascination as 'intriguing' does. Thus, the correct answer encapsulates the spark of interest and appeal that comes with the term.