seriously (adv.)
- actively
- actually
- ardently
- assuredly
- badly
- candidly
- certainly
- clearly
- critically
- dangerously
- decidedly
- decisively
- decorously
- demonstrably
- demurely
- deplorably
- determinedly
- devotedly
- devoutly
- down
- earnestly
- fervently
- fervidly
- firmly
- fixedly
- formally
- gravely
- grimly
- heartily
- heatedly
- honestly
- indeed
- indubitably
- inflexibly
- intensely
- intently
- manifestly
- noticeably
- observably
- obstinately
- obviously
- openly
- passionately
- patently
- perseveringly
- persistently
- positively
- purposefully
- quite
- really
- relentlessly
- resolutely
- sedately
- sensibly
- severely
- sincerely
- soberly
- solemnly
- somberly
- staidly
- staunchly
- steadfastly
- steadily
- tenaciously
- thoughtfully
- truly
- unambiguously
- undeniably
- unmistakably
- unquestioningly
- unswervingly
- vehemently
- verily
- very
- vigorously
- visibly
- wholeheartedly
- zealously
