She's been dropping subtle hints about what she'd like as a present.

她不断隐隐暗示她喜欢什么样的礼物。

《牛津词典》

Subtle hints do not work!

微妙的暗示没有用！

youdao

There were subtle hints in his letter.

他的信中有些微妙的暗示。

youdao

The EP's five tightly crafted pop songs can be sugary sweet, but subtle hints at psych-rock and noise-pop give the sound a rich flavor.

NPR: Falcon: 'The Sandfighter'

Sometimes this involves picking the person who looks the most suspicious, even if we've never seen him before, or being swayed by the subtle hints of police officers and lawyers.

WSJ: Jonah Lehrer on Memory, Witnesses and Crime | Head Case

The study suggests not just that humans are tuned to watch for subtle hints of sketchy behavior, but that future humanoid robots could foster trust by using the right gestures.

ENGADGET: Nexi robot helps Northeastern University track effects of shifty body language (video)