definitely

As adverbs the difference between rarely and definitely

is that rarely is not occurring at a regular interval; seldom; not often while definitely is without question and beyond doubt.

As adverbs the difference between inevitably and definitely

is that inevitably is in a manner that is impossible to avoid or prevent while definitely is without question and beyond doubt.

As adverbs the difference between decisively and definitely

is that decisively is in a decisive manner while definitely is without question and beyond doubt.

As adverbs the difference between probably and definitely

is that probably is in all likelihood while definitely is without question and beyond doubt.

As adverbs the difference between actually and definitely

is that actually is in act or in fact; really; in truth; positively while definitely is without question and beyond doubt.

As an adjective certain

is sure, positive, not doubting.

As a determiner certain

is having been determined but unspecified. The quality of some particular subject or object which is known by the speaker to have been specifically singled out among similar entities of its class.

As an adverb definitely is

without question and beyond doubt.

As adverbs the difference between definitely and necessarily

is that definitely is without question and beyond doubt while necessarily is inevitably; of necessity.

As adverbs the difference between definitely and unquestionably

is that definitely is without question and beyond doubt while unquestionably is without question; beyond doubt; indubitably.

As an adverb definitely is

without question and beyond doubt.

Definitely is a related term of unequivocally.

As adverbs the difference between definitely and unequivocally

is that definitely is without question and beyond doubt while unequivocally is in an unequivocal or unambiguous manner.