na-adjective, noun
innocent; naive; inexperienced
Describes a young person, especially a girl, who is innocent, unworldly, or inexperienced. Often carries a gentle or slightly old-fashioned tone.
彼女はまだおぼこで、世間のことをよく知らない。
She is still innocent and doesn't know much about the world.
おぼこな考え方だけど、それが
noun
Refers to a virgin, especially a young woman. Can be used in a slightly old-fashioned or literary context.
昔はおぼこであることが重視された時代もあった。
There was a time when being a virgin was highly valued.
noun
Specific term for a young striped mullet (Mugil cephalus). Used in fishing and culinary contexts.
See also: 鯔 (ぼら)
この辺りの川では、春になるとおぼこがたくさん獲れる。
In the rivers around here, many young striped mullet are caught in spring.
His way of thinking is naive, but that's part of his charm.
The origin is uncertain. It may be related to the word おぼこい (childish, innocent) or derived from a mimetic root. The kanji 未通女 is a gikun reading, meaning 'not yet a woman,' but this is a later association rather than the etymological origin.