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unupsettable
unupsettable adj.
Brit. 
/ˌʌnʌpˈsɛtəbl/
, /ˌʌnʌpˈsɛtəbl/U.S. /ˌənˌəpˈsɛdəb(ə)l/
/ˌənˌəpˈsɛdəb(ə)l/ΚΠ
1834 Tait's Edinb. Mag. New Ser. 1 39/2 Those..vehicles, that once rolled in slow and unupsettable solemnity along.
1922 W. S. Rainsford Story of Varied Life viii. 81 Good Red River carts.., unbreakable and almost un-upsettable.
2011 N.Y. Times (Nexis) 1 July The focus at Wimbledon on Wednesday was Jo-Wilfried Tsonga's upset of the once un-upsettable Roger Federer.
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