In modern Chinese 谆 almost always appears doubled as 谆谆 (zhūnzhūn) — 'patiently and earnestly,' especially of an elder advising a junior. Most famous collocation: 谆谆教导.
history
From 《诗经·大雅·抑》: 诲尔谆谆 ('teach you earnestly') — the classical source for the doubled form.
