Im interested in southern Ireland for a honeymoon in MID-Late August.what are good areas without big crowds

Crowds are smaller in places of less interest to visitors. I don't expect that is much help to you.

Truly, I don't think crowds are a big problem in most scenic areas. There might be difficulties at particular attractions.

What sort of activities appeal to you?

I agree with Padraig. 'Crowds' are likely to be a factor only if you have a particular inn that you prefer to stay or a restaurant that you want to eat in.
For a honeymoon destination I would probably fly into Shannon and stay at Dingle.

I was thinking about staying near Dinglr for a week and then moving on to a few other sites , maybe along the east coast.We like the coast,quaint towns,nice pubs and restaurants

In August the number of cars on the narrow roads of the Dingle peninsula can be quite high. You won't have traffic jams, but driving might be slow as you can get caught behind a nervous driver or one who is more interested in scenery than in making progress. It's not a problem if you are in slow mode yourself, but can be a nuisance if you are trying to get Dingle "done" and hightail it back to your B&B in Killarney.

If you stay on the Dingle peninsula and are interested in living in the scenery rather than simply looking at it and passing by, you can enjoy it very much.

On the east coast, I would suggest the Wicklow Mountains. Glendalough can get crowded, especially at weekends, but it is still worth seeing. You can still get away from people in other parts of the mountains.

I love Ireland... been to several parts and the best places i enjoyed have been in Kerry area... very pretty and just wonderful people!. Going again in may to Killarney... just wonderful places in Ireland.... relaxing, great scenery and just good people.
Never been in summer months... we always go out of peak season.

Hope you have a lovely time.

I had a honeymoon in Ireland in mid August 10 years ago (seems like yesterday.) We spent 2 weeks there and went to very "touristy" places - Ring of Kerry, Dingle, Killarney, Dublin, and some other places I'm sure I've forgotten. Yes, August is a busy time in Ireland, but I don't remember being bothered by crowds at all. Ireland is so beautiful and the people are so wonderful that the crowds aren't a problem. It's not like Rome where you'll have crowds and oppressive heat. That is what will really get to you.

Northern Ireland is less crowded. Fermanagh, Donegal, and the Mourne Mountains in County Down are especially beautiful. But don't worry so much about crowds that you stay away from must see places in Ireland, like Dingle or the Cliffs of Moher. If you are going to be in Dublin and you have any interest in Irish history, I highly recommend that you see the Kilmainham Jail. This is where the leaders of the 1916 Easter Rising were held and executed. It is amazing.