1. Having the convex shape of a helmet

See also: bulging, convex

• improving
• improvisation
• improvisational
• improvisatory
• improvise
• improvised
• improvised explosive device
• improviser
• improvize
• imprudence
• imprudent
• imprudently
• impudence
• impudent
• impudently
• impudicity
• impugn
• impugnable
• impugner
• impuissance
• impuissant
• impulse
• impulse explosive
• impulse turbine
• impulse-buy