Ex-Seatte DB Kemah Siverand says he's sorry for sneaking a woman into the Seahawks' hotel earlier this month ... saying straight up his actions were "absolutely inexcusable."
Kemah was fired by Pete Carroll 2 weeks ago after Seahawks officials caught him dressing up a female companion in player gear in an effort to get her past security and into his room.
The 23-year-old says after stewing over it all the past 14-or-so days ... he's realized the whole operation was a boneheaded idea -- and called the entire thing a "lapse in judgment.