Well, you can do certain exercises that use many parts of the body including the abdominal region.
I like exercises based on natural movement. Honestly, when, in real life, are you going to need to be able to do a sit-up for a functional purpose? When are you going to be relying solely on your abdominal muscles. Right. Never. So why then, should we isolate them in these ridiculous exercises that have us bending and rolling on the floor?
Now, I can see if you're really after a lot of super ab-definition, like Chillen for example

, then you can benefit from ab isolating exercises. But as you said, you're not into that. If you do some lifts that use compound movements that include the abdominals, you will work them just fine.
The Deadlift is a great example. It requires a very strong core, and you will build a strong core doing them. Wood chops are also good. Whatever you do, pick exercises that mirror natural human movements. The deadlift is the equivalent of lifting a heavy box off the floor. The wood chop is the equivalent of, well, chopping wood or swinging a heavy object. Single leg dumbell squats are also good. You end up using your core for balance and support.
For your purposes, I really don't see the need for separate ab-isolating exercises. You will work them doing, other, more full body type exercises and they'll be doing what they were made to do: Support the rest of the body while it does work.
Honestly, I've come out of workouts where I've done no traditional "ab" exercises and my abs are burning the next day. It's not like they're not being used if you're not doing crunches. And I'll got pretty decent definition, for a girl...