Thai spelling reform of 1942

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. 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.

Proposed simplification of the Thai writing system
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:


 * 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 consonants in วรรค ด (ด ต ถ ท ธ น).
 * ใ is uniformly replaced with ไ.
 * ญ is replaced with ย in initial position (e.g., ใหญ่ > ไหย่), but retained in final position 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).
 * ห replaces the leading 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).