Words That Rhyme With "Frightfully" :
3 syllables:
doubtfully, fatefully, finally, fitfully, gyrally, hatefully, lightsomely, mindfully, rightfully, spinally, spirally, spitefully, thoughtfully, tidally, vitally
4 syllables:
deceitfully, delightfully, delightsomely, despitefully, excitedly, forgetfully
5 syllables:
adjectivally, genitivally, homicidally, substantivally, suicidally