Thailand's King Maha Vajiralongkorn has stripped his royal consort of her titles and military ranks for being "disloyal against the monarch", the palace said.

Key points: Sineenat Wongvajirapakdi was stripped of her royal consort title and military decorations for being "ungrateful"

Sineenat Wongvajirapakdi was stripped of her royal consort title and military decorations for being "ungrateful" King Maha Vajiralongkorn had bestowed her with the title three months ago, just several months after his marriage to Queen Suthida Vajiralongkorn na Ayudhaya

King Maha Vajiralongkorn had bestowed her with the title three months ago, just several months after his marriage to Queen Suthida Vajiralongkorn na Ayudhaya The palace released dozens of rare, intimate images of Sineenat in August

The announcement came just months after Sineenat Wongvajirapakdi was bestowed the rank of "Chao Khun Phra", or royal noble consort, by the king on his 67th birthday in July, the first such appointment in almost a century.

Less than a month later, the palace released more than 60 rare, glossy images and a biography of Sineenat, including candid and action-packed photos of her aiming a weapon on a firing range, parachuting and piloting a plane.

The website crashed shortly after they appeared, possibly due to a surge in demand from a startled public.

Royal consort Sineenat Wongvajirapakdi was stripped of her titles and military ranks for "breaching a code of conduct for courtiers" and being "disloyal to the king", according to a palace statement. ( Thailand Royal Office )

The 34-year-old former army nurse had breached a code of conduct for courtiers and was "disloyal to the king", a two-page palace statement published in the royal gazette said.

"Royal Noble Consort Sineenat is ungrateful and behaves in ways unbecoming of her title," the statement said.

Sineenat's appointment as consort came two months after the king's marriage to the deputy head of his personal bodyguard, Suthida Tidjai, 41.

He named her his queen, just days before his coronation in May, with the title of Queen Suthida Vajiralongkorn na Ayudhaya.

The Thai King appointed Sineenat Wongvajirapakdi as royal consort three months after he married Queen Suthida (pictured). ( AP: Bureau of the Royal Household )

Suthida is the fourth wife of the monarch.

The statement also described Sineenat as "ungrateful".

"She is also not content with the title bestowed upon her, doing everything to rise to the level of the queen," it said.

"She lacks the understanding of the good traditions of the royal court. She displays disobedience against the king and the queen."

The king is not as well known to the public as his beloved father Bhumibol Adulyadej, who died in 2016.

Sineenat Wongvajirapakd was the first person to be awarded the title of Royal Noble Consort in nearly a century. ( AFP: Thailand Royal Office )

Reuters/AP