stormy
Word family
Synonym discussion
Sense: adjective/1
All four words describe unpleasant weather, but they differ in emphasis and register. 'Stormy' is the most general and common term, covering strong wind, heavy rain or snow, and often thunder. 'Blustery' is narrower — it focuses on strong, gusty wind without necessarily involving rain or a full storm, making it milder in intensity. 'Tempestuous' is a more literary and dramatic word; it suggests a violent storm and is also frequently used figuratively for emotions. 'Rough' is a broader, more informal word that applies mainly to sea conditions ('rough seas') rather than the sky or weather in general. For everyday conversation about a windy, rainy day, 'stormy' is the best choice. If you want to describe the sea as dangerous, 'rough' works well. For a dramatic or poetic tone, 'tempestuous' fits.
Etymology
Stormy comes from the Old English word 'stormig', formed from 'storm' (a violent weather event) and the suffix '-ig' (which later became '-y', meaning 'having the quality of'). The literal weather meaning has been in use since before the 12th century. By the 14th century, the word had developed a figurative sense describing angry emotions or heated arguments. Stormy is related to similar words in other Germanic languages, such as Dutch 'stormig' and German 'stürmisch'.