While there isn't a single universally agreed upon "longest word" you can type with only your left hand, here are some contenders, depending on your keyboard layout and how strictly you define "left hand only":
* "stewardesses" (13 letters) - This is a common answer, as all the letters are on the left side of the keyboard.
* "statuesque" (10 letters) - This word is a bit shorter, but it's another option where all the letters are on the left side.
* "assaulter" (9 letters) - This word is a bit shorter, but it's still a valid option as all the letters are on the left side.
Important Note: The "longest word" can vary depending on whether you include the Shift key as part of the "left hand" or just the letters. Some people might use the shift key with their left hand, which could open up even more possibilities!
Let me know if you want to explore more words based on specific keyboard layouts or rules!