sian adjective2 •(Singapore, informal) Bored, weary or fed up; tired (of something).“In a country where aspiration drives so much of who we are and what we want, it’s particularly sian to feel stuck,” he suggested. — 2021 •(Singapore, informal) Repetitive and boring, wearisome.— Sian. Fucking sian. — Complain less. You bite that pencil anymore next time got termites inside you. — 1997 formsmore sian · most sian