1861 Christian Remembrancer Oct. 377 We may just as well say for sake of saying something, that an upland in order to graduate as a mountain must prove 1,500 feet elevation above the sea combined with some peculiar rockiness or peakiness of outline, or the possession of notable panoramic advantages.

1921 L. B. Turner Wireless Telegr. iii. 22 The ‘peakiness’ of this curve measures the ‘sharpness of tuning’.

1924 W. Deeping Three Rooms ii. 12 That slight peakiness about the chin, the ugly lines in the throat.

1965 Econ. Jrnl. 75 710 The way in which the hydro-electric station is operated may be affected by alterations in the peakiness of consumption.

2003 Advertiser (Adelaide) (Nexis) 30 Oct. 20 The inefficient use of generation assets, due to peakiness of electricity demand, increases the overall cost of generation.

1922 S. J. Weyman Ovington's Bank xlii. 506 He would begin to think of it as a thing possible some day..—if there were more peakiness. The girl did not whine... But if she ailed, then, [etc.].

1963 P. Murray Art of Renaissance v. 152 The Christ Child in his small devotional Madonnas is of a pathetic homeliness, with thin little upturned feet and a wistful peakiness.

1971 Times 8 Mar. 12/3 Hoffman has detected a certain peakiness in the President's appearance lately.