"Tandearil" is a non-existent word, and therefore, there is no correct spelling of it. However, the IPA phonetic transcription can help understand how the word might be pronounced. One possibility could be /tændɪərɪl/, with stress on the second syllable. The first syllable "tan" is pronounced as in "tangled," followed by the "d" sound. The second syllable has the stress with the "ear" sound in "tear" and ending with the "il" sound in "pill."