The word "渺茫" is formed by combining two characters: "渺" integrates the water radical (氵) with "眇", meaning distant or small, to convey vastness or obscurity; "茫" integrates the water radical (氵) with "芒", meaning blurry, to convey vagueness or boundlessness. Together, they create a compound word where both characters semantically reinforce the idea of something distant, indistinct, or uncertain.