skyndilegur
Skyndilegur is an Icelandic adjective meaning “rapid, sudden,” used to describe events, actions, or phenomena that occur quickly or abruptly. It conveys a sense of immediacy or unanticipated change, rather than merely high speed.
In modern usage, skyndilegur emphasizes abruptness or surprise. It can describe weather changes, decisions, or processes
The form is built with the common Icelandic adjective suffix -ilegur; it is related to other words
Examples: Skyndilegur atburður kom upp í gær. (A sudden event occurred yesterday.) Hún tók skyndilega ákvörðun.