tranchant

/tʁɑ̃.ʃɑ̃/
1.
adjective

sharp (physically able to cut)

Fais gaffe, ce couteau est très tranchant.

Watch out, this knife is very sharp.

2.
adjective

incisive; cutting (figurative); decisive

Sa remarque était tranchante et a mis fin au débat.

Her remark was cutting and ended the debate.