处心积虑

Explanation: At heart: deliberately; product consider: After a long period of tigers. Describe the long-planned. 　　Usage: Joint type; as adverbial; negative, suggesting racking their brains to do bad things 　　Source: "Year of Guliang hidden": "He even almost Bor? Very Bor of deliberately into the Killer." 　　Examples: So who ~, has been a day. (Qing Li Baojia "Bureaucrats" forty-sixth back) 　　Riddle: Steller Thesaurus:  go to great pains, work hard and carefully to keep one's business going, elaboration, painstaking accomplishment, rack one's brains, Deep thinking, make extraordinarily painstaking efforts, lucubrate, Bruising, cudgel one's `brains think very hard, Of peaceful contemplation search for, make painstaking efforts, think twice about doing sth., Puzzle, to manage with great pain Antonym Group:  Lver Caogu, regard … as a trifling matter