certainly (adv.)

• absolutely
• actually
• alright
• assuredly
• clearly
• da
• decidedly
• decisively
• definitely
• demonstrably
• distinctly
• exactly
• factually
• fatefully
• fine
• forsooth
• good
• historically
• indeed
• indubitably
• ineluctably
• inescapably
• inevitably
• inexorably
• inflexibly
• irrevocably
• manifestly
• naturally
• necessarily
• noticeably
• observably
• obviously
• okay
• patently
• positively
• precisely
• quite
• rather
• really
• relentlessly
• right
• sensibly
• seriously
• sure
• surely
• truly
• unambiguously
• unavoidably
• uncontrollably
• undeniably
• undoubtedly
• unequivocally
• unmistakably
• verily
• visibly
• yea
• yeah