The word Pleinly is misspelled against Plainly, an adverb meaning "In a plain manner; clearly."
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Word contains consecutive vowels 'AI' in between alphabets pl & nly is misspelled as 'EI'
Wrong Spelling:  pl-ei-nly 
Correct Spelling:  pl-ai-nly 
Find more wrongly spelled words of Plainly to spell it well.