The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning. Past participles:arisen, been, befallen... This is the British English definition of striven.
Personally, sarcasm can mean a couple of things depending on how it is dealt out. If it is sarcastic in a funny way, that person may have a sense of humor. If it is said in a mean way, than that person is probably insecure and unhappy. IMHO!
As with satire, sarcasm depends on the listener or reader to be in on the joke. Sarcasm is insincere speech. Your mom asks if you're excited to start cleaning the kitchen and you say, Yeah, right, when you mean Heck no.. Take this exchange from The Hunger Games.