From Japanese-English FreeDict Dictionary ver. 0.1:
[ichi1] [news1] [nf01] 四 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, 4, 肆 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, [ichi1] し /ɕˈi/, (四) [ichi1] [news1] [nf01] よん /jˈo̞ɴ/, (四) よ /jˈo̞/ (numeric) (肆 is used in legal documents) four
From Japanese-English FreeDict Dictionary ver. 0.1:
恣 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, 擅 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, 縦 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, 肆 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, ほしいまま /hˌo̞ɕiːmˈämä/ (adjectival nouns or quasi-adjectives (keiyodoshi))
Note: word usually written using kana aloneselfish, self-indulgent, arbitrary