"hellish" in the adjective sense
1. beastly, hellish, god-awful
informal) very unpleasant
"hellish weather"
"stop that god-awful racket"
2. demonic, diabolic, diabolical, fiendish, hellish, infernal, satanic, unholy
extremely evil or cruel expressive of cruelty or befitting hell
"something demonic in him
Source: WordNet® (An amazing lexical database of English)
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