Definition of "appalling"

Sir Thomas Royden, Chairman of the L.M.S.R., and Mr. Robert Holland-Martin, Chairman of the Southern Railway, both deplored the wholesale robbery and petty pilferage which have increased until they have reached appalling dimensions.

1942 May-June, “Theft on the Railways”, in Railway Magazine, page 130

Karius has too much previous for this to be considered a one-off and, as goalkeeping mistakes go, his errors in the 51st and 83rd minutes were as bad as one another. In fact, they were not just bad. They were appalling, so wretched it was difficult to recall a worse goalkeeping performance in any major final through the years.

2018 May 26, Daniel Taylor, “Liverpool go through after Mohamed Salah stops Manchester City fightback”, in The Guardian (London)‎