0 in a way that is extreme and difficult to bear:
Progress has been excruciatingly slow.
excruciatingly painful/uncomfortable
excruciatingly embarrassing/boring/funny
Lastly, the book was not as successful as it could have been due to inelegant organization and excruciatingly dry, overly detailed text.
Consider, for instance, an infant or small child who must undergo an excruciatingly painful set of operations to correct a serious medical problem.
The elaborate tonal structure makes it excruciatingly difficult for adult neophytes.
These goals are variable and context-dependent, making their explication and formalization over and above individual situations excruciatingly difficult.
Because agents' information processing capacities are limited, substantive rationality in the sense of universal optimising capacities is excruciatingly costly or simply unreachable.