spreading throughout; omnipresent; present everywhere
Nowadays the country is troubled by a pervasive anxiety about the economy.
per (through)#vadere (to go, walk) (Latin)
perva (means festival in hindi) festivals are spread thorughout (per)+ (vas)ive. here per:throughout and vas:to go so to go or spread every where. sounds like persuasive, if u are persuasive youre ideas will be pervasive