1st group "Atama ga ii", "Kashikoi" and Riko na is same mean Smart or Sharp and same usage If translate word by each Japanese kanji Atama ga ii = have good brain Kashikoi = wise Rikou = clever mean. 2nd group Umai can use good in act and taste but Jyozu is skillful is original means and only use good in act. some translation in English use same word in English