informal

to not be very good at doing something.

He was a very creative chef but no great shakes on the management side of business.

• be a closed book
• be a [crisis/disaster etc.] in the making
• be a crisis in the making
• be a crock of shit
• be a cut above
• be a cut above someone
• be a cut above something
• be a dab hand
• be a dead cert
• be a dead loss
• be a dead ringer for
• be a dead ringer for someone
• be a dead ringer for something
• be a different kettle of fish
• be a dime a dozen
• be a disaster in the making
• be a far cry from
• be a far cry from something
• be a fate worse than death
• be a figment of imagination
• be a figment of the imagination
• be a figment of your imagination
• be a fine figure of a man
• be a fine figure of a woman
• be a force to be reckoned with