いけん /(exp) (1) (See いけない・1) (col) bad/wrong/naughty/(exp) (2) (after the -te form of a verb or adjective) (col) must not (do, be)/should not/ought not to/(exp) (3) (col) useless/no good/bad/(exp) (4) (col) hopeless/beyond hope/(exp) (5) (used to express sympathy) (col) unfortunate/a shame/a pity/(exp) (6) (col) unable to drink (alcohol)/EntL2750130/