<p><strong>Adjective</strong></p><ul><li>moving or capable of moving with great speed or velocity; fleet; rapid: a swift ship.</li><li>coming, happening, or performed quickly or without delay: a swift decision.</li><li>quick or prompt to act or respond: swift to jump to conclusions.</li><li>quick to perceive or understand; smart; clever: You can't cheat him, he's too swift.</li></ul><p><strong>Adverb</strong></p><ul><li>swiftly.</li></ul><p><strong>Noun</strong></p><ul><li>any of numerous long-winged, swallowlike birds of the family Apodidae, related to the hummingbirds and noted for their rapid flight.</li><li>tree swift.</li><li>spiny lizard.</li><li>Also called swift moth, any of several brown or gray moths, the males of which are usually white, of the family Hepialidae, noted for rapid flight.</li><li>an adjustable device upon which a hank of yarn is placed in order to wind off skeins or balls.</li><li>the main cylinder on a machine for carding flax.</li></ul>