At Random or Arbitrarily?

Arbitrary means there's no particular reason to choose a certain way (arbitrarily is the adverb, same meaning). Random means no one decided which choice it is.

What does it mean to do something arbitrarily?

1 : made, chosen, or acting without thought of what is fair or right arbitrary decisions an arbitrary ruler. 2 : seeming to have been made or chosen by chance We were given an arbitrary list of books to choose from. Other Words from arbitrary. arbitrarily \ ˌär-​bə-​ˈtrer-​ə-​lē \ adverb.

Does arbitrary mean pointless?

Arbitrariness is the quality of being "determined by chance, whim, or impulse, and not by necessity, reason, or principle". It is also used to refer to a choice made without any specific criterion or restraint. Arbitrary decisions are not necessarily the same as random decisions.