1
general::
completely
to the greatest degree or in every way:
• That’s a completely different subject. • Bad weather had completely destroyed the crops.
totally/absolutely
especially spoken completely:
• I’m totally exhausted. • He’s absolutely right.
entirely
completely – used especially in negative sentences or after ‘almost’:
• I’m not entirely sure. • The community is almost entirely dependent on farming.
utterly
completely – used especially to emphasize strongly disapproving words:
• It was utterly impossible to work in the house. • The whole thing is utterly absurd.
fully
completely – used especially to show that you completely understand something or that you have all the information you need:
• He was fully aware of what was happening. • The disease is still not fully understood.
Longman-Thesaurus