Incorrect spelling, explanation: this spelling is a mistake because consider comes from Latin considerare, so s remained from the original spelling. Concider is an incorrect form, and it would also be spelled in a different way. Consider is pronounced [kuhn-si-duh], while concider would be pronounced [kuhn-sai-duh]).

Correct spelling, explanation: consider is the correct spelling, as the word comes from the Latin considerare, also spelled with s. Spelling with c, concider, is incorrect for the same reason, moreover, the word would be spelled differently [kuhn-sai-duh], while consider is spelled [kuhn-si-duh]).

Definition of consider:
verb, regard in a certain way
I think we should consider going abroad this holiday.
She doesn’t consider changing her hair colour anymore.

Incorrect spelling

Incorrect spelling

Incorrect spelling