Past tense of excogitate; thoroughly thought out, devised, or invented through careful mental effort.
From 'excogitate' + '-ed' (past tense). The past participle form indicates the completion of the thinking process.
In older texts, you'll see 'excogitated' used to describe complex theories or inventions that required real genius—it's a word that pays respect to difficult thinking, treating mental work with the seriousness once reserved for physical labor.
Complete word intelligence in one call. Free tier — 50 lookups/day.