Not readily noticed or seen
Not showy or obtrusive
He usually dressed in black, with unobtrusive propriety.
Like another Socrates, he taught them to know themselves, repressing vanity, encouraging the despondent, and attaching all alike by his unobtrusive sympathy.
In an unobtrusive way weevils do immense harm to vegetation.
The happiness of the Epicurean was, it might almost seem, a grave and solemn pleasure - a quiet unobtrusive ease of heart, but not exuberance and excitement.
Bold as are his opinions in his works, here he was wholly unobtrusive of theories that might not have commended the assent of all present.