The word Obtunable is misspelled against Obtainable, an adjective meaning "Capable of being obtained."
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Word contains consecutive vowels 'AI' in between alphabets obt & nable is misspelled as 'U'
Wrong Spelling:  obt-u-nable 
Correct Spelling:  obt-ai-nable 
Check more misspelled words of Obtainable to spell it correct.