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Abysmal
Negative Connotation
The word 'abysmal' suggests a very strong level of disapproval or disappointment regarding quality. 
Intensity Amplifier
Use 'abysmal' to emphasize the severity of a situation or the extent of poor quality. 
Not for Slight Dislikes
'Abysmal' is reserved for extreme cases and shouldn't be used for mild dissatisfaction. 