1. In an irresponsible manner
   "he acted irresponsibly"

See also: irresponsible

Antonym: responsibly

• countermine
• countermortar fire
• countermove
• counteroffensive
• counteroffer
• counterpane
• counterpart
• counterperson
• counterplan
• counterplay
• counterplea
• counterplot
• counterpoint
• counterpoise
• counterpoised
• counterpoison
• counterpose
• counterpreparation fire
• counterproductive
• counterproposal
• counterpunch
• counterreformation
• counterrevolution
• counterrevolutionary
• counterrevolutionist