Stiltiest is a superlative form of the adjective "stilty," meaning having or resembling stilts. Its spelling can be explained using the International Phonetic Alphabet (IPA) phonetic transcription. The first syllable, "stil," is pronounced as /stɪl/, with the "i" sounding like "ih." The second syllable, "-ti-," is pronounced as /tɪ/, with the "i" sounding like "ih." The last syllable, "-est," is pronounced as /ɛst/, with the "e" sounding like "eh." Therefore, "stiltiest" is pronounced as /ˈstɪl.ti.ɛst/.