I'm absolutely / fairly certain. There is no doubt in my mind.
absolutely
I can't concentrate on my work because I'm really / slightly hungry. I have to get somthing to eat!
really
Julia was a little / totally amazed by the spectacular mountain scenery.
totally
Strong or weak QUITE? I made it quite clear that I don't want to talk about it any more.
Strong (absolutely/completely clear)
Luke is extremely / a bit tired because he skipped his afternoon nap.
a bit
It was a relatively / tremendously good film. I think everyone should see it.
tremendously
Amir felt very / somewhat stressed that his bus arrived five minutes late, but he knew he'd still get to work on time.
somewhat
Strong or Weak QUITE? The teacher is quite sure the exam is on Wednesday, but she is going to double check
Weak (fairly sure, but not completely sure)
He felt a bit / really frustrated when he couldn't go to the party, but he was happy to go to the cinema, instead.
a bit