keenest

Among the keenest observers of the test flights in Texas is Nasa.

The most exciting auteurs are the keenest readers of plays.

England boss Gareth Southgate will no doubt be among the keenest of observers when the pair meet in the first leg in Munich on Tuesday.

Among the keenest observers on Thursday will have been the US space agency.

A January 1924 report in The Times of London described how Queen Mary, then 57, had inspected her gift “and expressed the keenest appreciation of its wonders,” which included running water and electric lifts.