off the top of one's head

1. In an impromptu way, without much thought, as in Off the top of my head I'd say we'll double our profits in a year. This idiom suggests one has not used the inside of one's head before making some statement. [Mid-1900s]

Related Words

• foolhardy 
• foolish 
• half-baked 
• ill-considered 
• imprudent 
• inappropriate 
• indiscreet 
• misguided 
• reckless 
• thoughtless