It is well-known that "irony" is one of the most abused words in the English language. The (main) definitions are:
- Expressing the opposite of literal meaning through subtext
- Incongruity between an actual result and the expected result
Examples of some general cases where irony is misused (off the top of my head; there are many more):
- Calling attention to a discrepancy: "I hate A, B, and C. Ironically, I am well aware that I myself am guilty of C."
- Creating a discrepancy: "I disliked it, but, ironically, it was the best movie I have ever seen."
- Generic, filler adverb: "Ironically, I couldn't care less."
- A situation where something has its opposite natural effect: "The ambulance ironically ran over the cat."
However, I have yet to find a resource suggesting alternatives for such colloquial uses. In particular, there are situations (like the above) that variants of "ironic" are used for that don't seem to have clear-cut substitutes.
Let's look at that vexing last one about ambulances and cats. The ambulance did indeed run over the cat, so it's not definition 1. Yet, it's not quite an incongruity between an actual result and an expected result, since no alternative expected result is given or implied. There doesn't seem to be a simple way to describe such a happenstance--except, by consensus, by abusing "irony".
The above situations (I'm pretty sure; don't hurt me) are not ironic by the dictionary definitions. But, the word "irony" is filling a semantic gap that doesn't seem to be solvable another way.
The above particular examples aren't individually important. Instead, I'm looking for an exhaustive list of situations where "irony" is abused along with corresponding correct terms for those situations. To this effect, I'm adding a community wiki answer below.