adj. 25B6; adjective
shameful behaviour : DISGRACEFUL, deplorable, despicable, contemptible, dishonourable, discreditable, reprehensible, low, unworthy, ignoble, shabby; shocking, scandalous, outrageous, abominable, atrocious, appalling, vile, odious, heinous, egregious, loathsome, bad; inexcusable, unforgivable; informal low-down, hateful.
a shameful secret : EMBARRASSING, mortifying, humiliating, degrading, ignominious.
admirable.