Vocab Progress Quiz #12b

Hi,

In this PrepSwift vocab quiz #12b, I found the following question:

The answer key is “reserved”, but when I checked the synonyms of laconic on google, I get the following result:

Here, not only is “blunt” a synonym of laconic, it is listed much before “reserved”.

Can you please explain why “blunt” is the incorrect pairing here? Thanks!

On the GRE, the definition/usage of laconic that is often tested is that which aligns with reserved/reticent