The correct spelling of the word is "most appealing," pronounced /moʊst əˈpilɪŋ/. The sound /ə/ represents the unstressed schwa sound, and /ɪŋ/ represents the suffix -ing. The letter combination "ea" in "appealing" is pronounced as a long "e" sound /i/ followed by a schwa sound /ə/. The word "most" is pronounced with a long "o" sound /oʊ/ followed by the "s" sound, and its stress falls on the first syllable /moʊst/. So remember, it's "most appealing," not "most pealing."