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!
My husband is very sarcastic and I have struggled to know how to cope with his sarcastic remarks. Some of my hurt comes from fear that he is actually feeling what he says and that sarcasm is his passive-aggressive way to convey what he really feels.