Advanced British English Quiz; Lesson 2; Part 3

Level up your English from basic to intermediate and advanced.
British English Quiz, Lesson 2. Part 3.
Which group is not semantically related?
sales beast, outperforming, closing deals, extraordinary prowess
whopping, extraordinary magnitude, astonishment, disproportion
live up to, meet expectations, fulfil, embody
impermanence, synthesise, integrate, coherent

Which group explains “low-key”?
modest, restrained, subdued, understated
in the guise, pretending, false appearance, innocence
under the disguise, deceptive outward form, enzyme, mimic
preconception, bias, chaos, brutality