firmly (adv.)
- adamantly
- close
- closely
- compactly
- consistently
- constantly
- decidedly
- decisively
- densely
- determinedly
- devotedly
- dourly
- earnestly
- faithfully
- fast
- firm
- fixedly
- forcefully
- forcibly
- grimly
- hardly
- heartily
- heavily
- immovably
- immutably
- impregnably
- inexorably
- inflexibly
- inseparably
- intensely
- invincibly
- irresistibly
- loudly
- loyally
- lustily
- mightily
- obdurately
- obstinately
- perseveringly
- persistently
- powerfully
- pungently
- purposefully
- relentlessly
- resolutely
- responsibly
- rigidly
- rigorously
- robustly
- ruggedly
- securely
- seriously
- sincerely
- solidly
- soundly
- staunchly
- steadfastly
- steadily
- sternly
- stiffly
- stoutly
- strongly
- sturdily
- tenaciously
- thick
- thickly
- tight
- tightly
- unalterably
- unchangeably
- uncompromisingly
- unrelentingly
- unswervingly
- unwaveringly
- vigorously
- wholeheartedly
