While it's not as strong as words like "hell" or "damn", it's still considered inappropriate in formal settings or around children.
Here's why:
* Origin: "Heck" is a euphemism for "hell," which is a strong religious curse word.
* Context: The context in which "heck" is used can make it more or less offensive. For example, "What the heck!" is considered a more casual exclamation than "Heck no!" which can sound more forceful.
* Cultural Differences: The perception of "heck" can vary depending on region, age, and personal beliefs.
Ultimately, whether or not "heck" is considered a swear word is subjective. It's always best to be mindful of your audience and choose your words carefully.