won't do or will get nowhere; impossible to carry out or implement

to be completely ignorant of something; to not know the first thing about a subject; to be all Greek to one

Extremely crowded or densely packed with people, such that even water cannot leak through

this road is blocked; (figuratively) this method does not work or is a dead end

(idiom) describes writing or speech that is nonsensical, trashy, or extremely poorly written

to be an expert in all things; to be proficient in every field (e.g., arts, sciences, or classics)

be so closely packed or sealed that no air can pass through; also used to describe a tight security or defense that is impossible to penetrate

to be illogical; to not hold water; it does not make sense

to have no contact with others; to be completely out of touch with neighbors or society

To not fully understand something or have only a partial mastery of a subject; often describes writing that is awkward or only half-intelligible.

to be unable to follow the reasoning; to find something incomprehensible or illogical

To be unable to get through to someone or a place, usually by telephone.

to be incompatible or contradictory; to be stubborn and unable to adapt or change one's views

to not make sense; to be unconvincing or unreasonable