For a given task, like digging a hole, many things are "useful". The set of all "useful" things contains, among other things "spoon", "pencil", "saucepan lid", "shovel", etc. There is a subset of this first list that contains "particularly useful" things like "shovel", "hoe", etc. Is there a single word adjective for "particularly useful".
Examples of how the word "x" might be used
- "For the purpose of our investigation, these data points are x"
- A note on this one: This is actually very close to the sentence that brought me to post this question. I don't want to convey that the other data points are not useful. Neither do I want to convey that without these data points, I can't get the job done.
- "A shovel would be x for digging that hole"
PS, I am not looking for "vital", "critical", "indispensable", "invaluable", because those all are stronger than what I'm looking for (they mean "so useful that one can't do without it", not what I'm looking for).