No problem is an English expression, used as a response to thanks (among other functions). It is regarded by some as a less formal alternative to you're welcome, which shares the same function.

In the culture of younger Americans, no problem is often used as a more conversational alternative to you're welcome.^[1]

It is widely believed that younger speakers especially favor no problem over you're welcome, and empirical research has corroborated this belief.^{[2][non-primary source needed]}

"No problemo" is "a popular elaboration" of "no problem" also used and popularized in North American English.^[3]

The expression is sometimes used as an instance of "pseudo-Spanish" or Mock Spanish.^[4] An early example appears in a 1959 edition of the American Import and Export Bulletin, with an advertisement stating: "Foreign shipping is No Problemo".^[5] Its usage as a Spanish expression is incorrect; a correct translation would be ningún problema, sin problema or no hay problema. Many Spanish words from Latin roots that have English cognates have an -o in Spanish from the masculine Latin suffix -us, such as "insect" (insecto), "pilot" (piloto), and "leopard" (leopardo); however, "problem" belongs to the group of words ending with an a in Spanish that have a similar English counterpart, such as "poet" (poeta), "ceramic" (cerámica) and "rat" (rata). In the case of problema, this is because it has a Greek 'ma' ending, and as such is among the Iberian words ending in 'ma', such as tema, which is in fact masculine.

• No worries
• Hakuna matata

• Andor, József (2008). No Problem (PDF). Lingua Franca Csoport. pp. 153–164. ISBN 978-963-642-300-1. {{cite book}}: |work= ignored (help)
• Brenner, Gail (September 23, 2011). Webster's New World American Idioms Handbook. John Wiley & Sons. ISBN 9780764524776.
• McKean, Erin (November 29, 2009). "The un-welcome - What's the problem with 'no problem'?". The Boston Globe.
• Richardson, Kristen (November 10, 2011). "My Problem with 'No Problem': It's Destroying Civility". The New York Observer.
• Schneider, Klaus P. (2005). No problem, you're welcome, anytime: Responding to thanks in Ireland, England, and the USA. Walter de Gruyter. pp. 101–139. ISBN 3110184699. {{cite book}}: |work= ignored (help)
• Tucker, Maria (January 29, 2009). "Here's the problem: 'No problem' is replacing 'You're welcome'". McClatchy Newspapers.

Look up no problem or no problemo in Wiktionary, the free dictionary.

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