The word Cuastically is misspelled against Caustically, an adverb meaning "In a caustic manner."
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Word contains consecutive vowels 'AU' in between alphabets c & stically is misspelled as 'UA'
Wrong Spelling:  c-ua-stically 
Correct Spelling:  c-au-stically 
Check more misspelled words of Caustically to spell it correct.