Board Thread:Questions and Answers/@comment-5510795-20141122012554/@comment-917693-20150102205421

By definition, a ryouseirui can sing both like a male and female.

So if the singer, cannot sing one of those, she's not a ryouseirui.

If her voice sounds like a male's though, she'd be considered a trap singer.

(Pointing out the difference between trap and ryouseirui.)

On a side note though, what people consider 'feminine' may vary from person to person. So even if someone isn't widely considered a ryouseirui, I think you can consider yourself, what you think of the voice quality and such.