Momentum = invidious = synonyms: unfair, unjust, discriminatory, iniquitous, weighted, one-sided; offensive, objectionable;deleterious, detrimental, unwarranted and so much more.
Simply delightful little fellows doncha think?

If twerp Shaw wishes to add insidious??? = proceeding in a gradual, subtle way, but with very harmful effects.Who am I to argue?
synonyms: stealthy, subtle, surreptitious, sneaking, cunning, crafty, Machiavellian, artful, guileful, sly, wily, tricky, slick, deceitful, deceptive, dishonest, underhand, backhanded, indirect; informalsneaky

Seems the laddie has an even more pisspoor opinion of momentum than myself.
Who would ever have believed that?

Are we talking semantics or petards here?