Incorrect spelling, explaination: this spelling is incorrect, because there is no reason to add vowel i when adding comparative suffix -r or -er. The core adjective is simple: simple + -r = simpler. When adding the suffix -er to the word ending with y we change this consonant to i and this may be the reason for this confusion.
Correct spelling, explaination: simpler is a comparative form of the adjective simple. To create comparative from a short adjective (up to 2 syllables) -r or -er is added to the base form. The misspelling
simplier may be a mistake based on adding the suffix to an adverb (simply), not adjective. Simplier is therefore wrong.
Definition of simpler:
adjective, comparative form of the adjective simple, something easier, more plain and uncomplicated
I think it would be simpler to call him than write him an e-mail.
Don’t be angry at my uncle. He is very simple and doesn’t have proper manners.
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