Oxford Dictionary
low-down
low-down informal ▶adjective mean and unfair: dirty low-down tricks. ▶noun (the low-down ) the true facts or relevant information about something: you get the low-down on where to go and where to stay away from.
Oxford Thesaurus
low-down informal
low-down informal adjective a dirty low-down trick: unfair, mean, despicable, reprehensible, contemptible, lamentable, disgusting, shameful, low, abject, unworthy, shabby, uncharitable, base, dishonourable, unprincipled, ignoble, sordid, wretched, loathsome, odious, treacherous, underhand; nasty, cruel, bad, immoral, wicked, wrong, evil, sinful, vile, foul, vicious, nefarious, heinous; informal rotten, dirty, stinking, beastly; archaic dastardly, scurvy. ANTONYMS kind, altruistic, unselfish. ▶noun (the low-down ) he gave us the low-down on his life as Britain's top comedian: inside information, the whole story, the facts; data, information, facts and figures, intelligence, the news; a briefing, a brief, guidance; informal info, the score, the gen, the latest, the word, the rundown; N. Amer. informal the poop, the dope.
Sanseido Wisdom Dictionary
low-down
l ò w-d ó wn 形容詞 ⦅くだけて ⦆〖名詞 の前で 〗1 卑劣な, 下劣な, 卑しむべき .2 =funky 2 .