“definitely”

In a way that leaves absolutely no room for doubt or misinterpretation.

“She unequivocally rejected his offer before he had even finished his sentence.”

Best for: Works well in formal writing, legal contexts, or emphatic speech.

In a manner that cannot be doubted or questioned.

“He was, indubitably, the most infuriating man she had ever loved.”

Best for: Slightly old-fashioned; excellent for witty or theatrical emphasis.

In an absolute, unconditional, and direct manner.

“The minister categorically denied any involvement in the scandal.”

Best for: Strong and direct; favored in journalism, politics, and debate.

With complete confidence and certainty.

“This is, assuredly, not how she imagined the evening would end.”

Best for: Elegant and composed; suits narrative prose and formal persuasion.

In a way that is impossible to deny, dispute, or contradict.

“The evidence incontrovertibly placed him at the scene before dawn.”

Best for: Best for legal, academic, or high-stakes argumentative writing.

In truth; used to assert something with absolute certainty.

“Forsooth, no finer pastry had ever graced that humble bakery counter.”

Best for: Archaic and theatrical; use for irony, humor, or deliberately ornate prose.