The rules were completely arbitrary.
Nobody made him do it; his decision was arbitrary.
Nobody made him do it. His decision was completely arbitrary.
Nobody made him do it; his decision was arbitrary.
her choice of clothing seemed arbitrary!
These are our output. But it is Arbitrary.
Our decision to go to the park was arbitrary.The rule was arbitrary but he was punished anyway.
He made an arbitrary decision to be on the green team. Most banks are prohibited from making arbitrary decisions on granting consumer loans. There is an arbitrary dividing line between VHF and UHF frequencies.
The demands you're asking for are arbitrary.
Determined by whim, chance, or impulse
Because it would be incomprehensible. Take all the sounds that people are capable of making, make sound bites out of them and randomly associate them. What do you have? Meaningless noise. It is because we learn which sounds not to make, which combinations of sounds do not make words, and which combinations of words do not make coherent sentences, and to discard the meaningless sounds, words, and sentences that we are able to use language at all. For example, your question does not use proper grammar, but an English speaker automatically corrects it to say "Why can a language not be fully arbitrary?" It's wrong but not arbitrary, because it is close to the correct sentence. Had you written "Language not be a fully arbitrary can why?" it is so wrong that nobody would understand it.
cruel, unreasonable, or arbitrary use of power or control
It is sometimes useful to use arbitrary units because it may take you too much time to figure out the logically ideal units to use, or you may not even know in which numerical range your results may fall.