is best behavior (verb) behave: act reasonably, properly
Sinonime: apish,
bogus*, counterfeit,
dummy,
ersatz*, faked,
false, feigned, forged,
fraudulent, hokey,
imitation, imitative, make-believe, mimic,
phony, pretended, pseudo*, put-on, quasi, sham*, simulated, so-called,
spurious,
substitute,
unrealAntonime: authentic, genuine,
real