Merriam-Webster Collegiate Dictionary - tempered

 adjective  Date: 14th century  1.  a. having the elements mixed in satisfying proportions ; temperate  b. qualified, lessened, or diluted by the mixture or influence of an additional ingredient ; moderated a pale gleam of ~ sunlight fell through the leaves — W. H. Hudson †1922  2. treated by tempering; especially of glass treated so as to impart increased strength and the property of shattering into pellets when broken  3. having a specified temper — used in combination short-~  4. conforming to adjustment by temperament — used of a musical interval, intonation, semitone, or scale