9 letters · 21 points in Scrabble
adverb without delay or hesitation; with no time intervening
originFrom Middle English forth-with (“at once, immediately; at the same time, already; straight ahead”) [and other forms], partly from the phrase forth with (something), and partly from forth-with-al, furth-with-al (“at once, immediately; together with”) (whence forthwithal).
Etymology from Wiktionary, CC BY-SA 3.0