Meaning : Many times at short intervals.
Example :
We often met over a cup of coffee.
Synonyms : frequently, oft, oftentimes, ofttimes
Not many times.
In your 1850 church you not infrequently find a dramatic contrast between the sumptuous appointments of the building itself and the inhuman barrack-like living conditions in the church room.Meaning : Frequently or in great quantities.
Example :
I don't drink much.
I don't travel much.
Synonyms : a great deal, much
Meaning : In many cases or instances.