illegitimate

bad, evil, immoral, shameful, sinful, unethical, wicked, wrong

blamable, blameworthy, censurable, reprehensible

banned, barred, contraband, criminalized, disallowed, discouraged, forbidden, interdicted, outlawed, prohibited, proscribed

bootleg, unauthorized, unlicensed, unsanctioned

under-the-counter, under-the-table

corrupt, unprincipled, unscrupulous, villainous

misleading, specious

half-baked, ill-advised, misguided, unconsidered, unreasoned

inconsistent

absurd, asinine, foolish, meaningless, nonsensical, preposterous, reasonless, senseless, silly

odd, peculiar, strange, surreal, unusual, weird

insane, mad, nutty, wacky (also whacky)

disordered, disorganized, rambling, random

unconvincing

inexplicable, unaccountable, unexplainable