(a situation causing) difficulty or trouble. (Cambridge Dictionary)
Irritating inconvenience. (Oxford Dictionaries)
Deliberate harassment. (Oxford Dictionaries)
A hassle is a situation that is difficult and involves problems, effort, or arguments with people. (Collins Dictionary)
If someone hassles you, they cause problems for you, often by repeatedly telling you or asking you to do something, in an annoying way. (Collins Dictionary)
A heated often protracted argument. (Merriam – Webster)
Why can’t it be hassle free?