quem sabe

quem sabe?

1. Used other than with a figurative or idiomatic meaning: see quem,‎ sabe.
2. who knows (a rhetorical question asked to show that the asker neither knows the answer nor who might know it)
3. who knows (asked to express the idea that anything is possible)
4. when directly followed by a clause: how about (introduces a suggestion)

quem sabe (not comparable)

1. maybe; perhaps (indicates uncertainty)

• talvez, quiçá