Thai spelling reform of 1942

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The Thai spelling reform of 1942 was initiated by the government of Prime Minister Field Marshal Plaek Phibunsongkhram. The prime minister's office announced a simplification of the Thai alphabet on 29 May 1942. The announcement was published in the Royal Gazette on 1 June 1942.^[1][2] The reform was cancelled by the government of Khuang Aphaiwong on 2 August 1944. Following the November 1947 coup, Phibunsongkhram became prime minister for a second time, but did not revive the Thai language reform.

A significant amount of redundancy of the Thai writing system was retained, in contrast to the simplification undertaken within the Lao language. The changes to simplify Thai spelling were:^[3]

• All of วรรค ฎ (i.e., ฎ ฏ ฐ ฑ ฒ ณ), the section of the alphabet corresponding to the Indic retroflex consonants, is gone, being replaced by their corresponding dental consonants วรรค ด (ด ต ถ ท ธ น) /d t tʰ n/.
• For /aj/, the vowel ใ, used in twenty specific words, is uniformly replaced with ไ.
• ญ is replaced with ย /j/ in initial position (e.g., ใหญ่ > ไหย่), but retained in final position as /n/ without its "base" (ฐาน).
• Of the three high /s/ consonants, ศ ษ ส, only ส is retained (e.g., ศึกษา > สึกสา).
• Initial /s/ cluster ทร is replaced by ซ (e.g., กระทรวง > กะซวง).
• Leading ho ห, which typically combines with low-class consonants to make high-class consonants, replaces the leading o อ in these four words อยาก อย่า อย่าง อยู่ (หยาก หย่า หย่าง หยู่).
• Many silent consonants that do not add to the pronunciation are eliminated (e.g., จริง > จิง, ศาสตร์ > สาตร).
• Some clusters are reduced (e.g., กระทรวง > กะซวง).

• Thailand in World War II
• Thai cultural mandates

• Thomas John Hudak, "Spelling Reforms of Field Marshal Pibulsongkram", Crossroads: An Interdisciplinary Journal of Southeast Asian Studies 3, 1 (1986): 123–33.