It was a Morgul blade. A piece of it broke off in the wound and poisoned the wound. It never fully healed and cause him pain for the rest of his life in Middle Earth.
The Nazgul King.
The Nazgul King stabs Frodo once in the shoulder. The tip of the morgul knife used snaps off inside Frodo. The tip is poisoned, but cannot kill, it is intended to cause fading: making Frodo permanently invisible (like the ring does) but also the slave of the Nazgul King.
Actually the One Ring did take over Frodo in the end, attracting Sauron's attention resulting in him sending a Nazgul to take the One Ring from Frodo. But before the Nazgul could arrive Gollum bit off Frodo's ring finger and fell into the "Cracks of Doom", destroying the ring, Sauron, and the Nazgul.
In reality, Frodo was defeated by Sauron, the One Ring's power overcame Frodo in the end and he announced his ownership of the ring, this drew Sauron's attention to Mount Doom and he ordered a Nazgul there to take the One Ring from Frodo and return it to its Maker - Sauron. Frodo would not have been able to fight a Nazgul and win, even with the One Ring to assist him as the ring wanted to return to its Maker and would not have assisted Frodo.All was now lost, except for one minor detail. Perhaps a half hour before arriving at the Cracks of Doom, Gollum had attacked Frodo and after Sam and Frodo had fought him off, Frodo in anger (perhaps without even realizing it) cursed Gollum, by the power of the ring, that "if Gollum ever touched Frodo again he would fall in the Cracks of Doom".Only moments before the Nazgul could arrive to take the ring, Gollum jumped Frodo, wrestled with him, bit off his ring finger (if that's not touching, I don't know what is). This activated Frodo's curse on Gollum by the power of the ring, causing Gollum to fall in the Cracks of Doom while celebrating taking "his" ring back, the ring fell with him and was thereby destroyed, thus fulfilling the quest of the Fellowship of the Ring.With the One Ring gone all Sauron's power was also gone, the Nazgul turned to smoke, Baradur collapsed, his armies scattered without guidance, and Sauron himself probably followed his master Morgoth into the void.
Frodo's wounds do not ever fully heal (Knife wound from Weathertop, Sting from Shelob) After his adventures, Frodo gets ill on the anniversaries of both of these wounds for as long as he lives.
The Nazgul King.
The Nazgul King stabs Frodo once in the shoulder. The tip of the morgul knife used snaps off inside Frodo. The tip is poisoned, but cannot kill, it is intended to cause fading: making Frodo permanently invisible (like the ring does) but also the slave of the Nazgul King.
He was taken to Elrond's house in Imladris.
she stabbed her self with a dagger
Actually the One Ring did take over Frodo in the end, attracting Sauron's attention resulting in him sending a Nazgul to take the One Ring from Frodo. But before the Nazgul could arrive Gollum bit off Frodo's ring finger and fell into the "Cracks of Doom", destroying the ring, Sauron, and the Nazgul.
he stabbed him with a dagger
It hurts. Depends on what you are being stabbed by. Really, imagine a dagger going through a can of oil.
In reality, Frodo was defeated by Sauron, the One Ring's power overcame Frodo in the end and he announced his ownership of the ring, this drew Sauron's attention to Mount Doom and he ordered a Nazgul there to take the One Ring from Frodo and return it to its Maker - Sauron. Frodo would not have been able to fight a Nazgul and win, even with the One Ring to assist him as the ring wanted to return to its Maker and would not have assisted Frodo.All was now lost, except for one minor detail. Perhaps a half hour before arriving at the Cracks of Doom, Gollum had attacked Frodo and after Sam and Frodo had fought him off, Frodo in anger (perhaps without even realizing it) cursed Gollum, by the power of the ring, that "if Gollum ever touched Frodo again he would fall in the Cracks of Doom".Only moments before the Nazgul could arrive to take the ring, Gollum jumped Frodo, wrestled with him, bit off his ring finger (if that's not touching, I don't know what is). This activated Frodo's curse on Gollum by the power of the ring, causing Gollum to fall in the Cracks of Doom while celebrating taking "his" ring back, the ring fell with him and was thereby destroyed, thus fulfilling the quest of the Fellowship of the Ring.With the One Ring gone all Sauron's power was also gone, the Nazgul turned to smoke, Baradur collapsed, his armies scattered without guidance, and Sauron himself probably followed his master Morgoth into the void.
He had been stabbed by a Morgul Blade which was slowly poisoning him.
Romeo's Dagger. in the Vault, after finding Romeo Dead beside her.
One of his bodyguards stabbed Philip with a dagger.
A 'dirk' is a dagger commonly used by the Scottish. "He stabbed him with a dirk." "She withdrew her dirk."