'inappropriately-cancelled' is a compound word formed from 'inappropriately' and 'cancelled.' 'Inappropriately' comes from 'inappropriate' (not suitable) plus the adverbial suffix '-ly,' and 'cancelled' is the past participle of 'cancel.'

'Inappropriately' comes from 'inappropriate,' which is from Latin 'in-' (not) + 'appropriate' (suitable). 'Cancelled' comes from Latin 'cancellare' (to cross out). The compound 'inappropriately-cancelled' is a modern English formation.

The meaning has always referred to something being cancelled in a way that is not proper or suitable.