The maximum late payment penalty is 25 percent of the amount due. You'll also owe interest on whatever amount you didn't pay by April 15. If you didn't get an extension, you are also looking at a late filing penalty of 5 percent of the unpaid tax per month plus interest. The maximum late filing penalty is 25 percent of the amount due.
The definition of felicitous is  something that is suited to a particular occasion or something enjoys the benefits of good fortune. When someone finds the perfect thing to say, it is an example of a phrase that would be described as felicitous.
There are four. The words are tremendous, horrendous, stupendous, and hazardous. Some say that there is also serendipitous, which means; lucky in making unexpected and fortunate discoveries. ( Serendipitous only counts really if you are looking for the sound of the suffix 'dous' as serendipitous ends in the suffix 'tous', yet it may sound like that. If you are looking for words with the suffix of 'dous' in spelling and not sound, then there are only four: tremendous, horrendous, stupendous, and hazardous.).