「鋭い」(するどい) describes something with a fine, keen edge or point, like a sharp knife or pencil. It can also refer to acute senses (e.g., sharp eyes), intelligence (e.g., sharp mind), or intense pain, implying precision, keenness, or intensity. Example: このナイフはとても鋭い。 (This knife is very sharp.)

先がとがっていること。また、感覚や思考が鋭敏なこと。