A past tense and a past participle of spoil.(verb)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "spoilt" in a sentence
"'Well, how spoilt is the great man?' inquired Lord John, mischievously."
"But, as one of the Sobral men wrote in his journal on the 30th, at 3 A.M., the mirror had again caused problems: It was found that there had been a serious change of focus, so that, while the stars were shown, the definition was spoilt."
"Stefan at Ogle Earth has kind of spoilt the fun however by explaining that it is merely a grid of higher resolution sounding data amid a lower-resolution dataset, taken from a ship surveying the area."