jam-up (noun) hindrance: obstruction, difficulty
Sinonime: Pecksniffian, affected, artificial, assuming, bland, canting, captious, caviling, deceptive, deluding, dissembling, double, double-dealing, duplicitous, faithless, false, feigning, fishy, fraudulent, glib, hollow, insincere, jivey, left-handed, lying, moralistic, oily, pharisaical, phony*, pietistic, pious, sanctimonious, self-righteous, smooth*, smooth-spoken, smooth-tongued, snide, specious, spurious, two-faced, unctuous, unnatural, unreliable
Antonime: advance,
aid,
assistance,
encouragement,
expedition,
help,
promotion,
push