rigorously (adv.)
- absolutely
- accurately
- adamantly
- badly
- conscientiously
- dead
- definitely
- directly
- dourly
- even
- exactly
- expressly
- exquisitely
- faithfully
- fiercely
- firmly
- furiously
- fussily
- grimly
- hardly
- harshly
- immovably
- immutably
- inexorably
- inflexibly
- just
- literally
- literatim
- madly
- meticulously
- minutely
- nicely
- obdurately
- painfully
- plumb
- point-blank
- positively
- precisely
- punctiliously
- punctually
- relentlessly
- right
- rigidly
- roughly
- scrupulously
- severely
- square
- squarely
- sternly
- stiffly
- straight
- strictly
- unalterably
- unchangeably
- uncompromisingly
- unerringly
- unrelentingly
- vehemently
- venomously
- verbally
- verbatim
- violently
- virulently
- wildly
