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The jet black Night Fury dragon that appeared alongside main protagonist Hiccup as the deuteragonist in the 2010 movie "How To Train Your Dragon". He is initially aggressive towards Hiccup but becomes friends with him after Hiccup helps Toothless become airborne again, after Toothless' left tail fin was ripped off when Hiccup shot him down.
Noun:

Person: Dude, Toothless is my favorite dragon EVER.
by SSG1 February 08, 2018
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When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
by ecogoth December 30, 2020
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2
A species of fire breathing dragons with black, sleek scales. This reptile is deemed to be dangerous and deadly, however when befreinded, the dragon will become a sort of guardian. The name "toothless" derives from the dragon's mouth which looks like it has the absense of teeth; but in times of danger, the dragon's vicious teeth are exposed.

The species was featured in the recent film, "How to Train your Dragon"
While playing tennis, the girl felt a crisp wind move her shot in-bounds and she knew Toothless, her guardian was in her presence.
by kridwid September 27, 2010
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