ponderous

adjective
1
too slow and careful; serious and boring
سنگین, کند, کسل‌کننده, خسته‌کننده, ملال‌آور
synonym tedious
2
moving slowly and heavily; able to move only slowly
سنگین, کند, سنگین حرکت, گام‌سنگین
She watched the cow's ponderous progress.
synonym laboured