The term MARVELLOUSLY can be summarized by two crossword solutions: WONDERFULLY (11 letters) and WELL (4 letters). WONDERFULLY is an adverb that means in a manner that is full of wonder or amazement. It is often used to describe something that is extraordinary or remarkable. WELL is an adverb that means in a satisfactory manner, or with skill or competence. It is often used to describe something that has been done with great care and attention. Together, these two words describe something that is done in an extraordinary and satisfactory manner.