Use 'bothersome' to describe mild to moderate annoyances, not severe problems. The neighbor's dog barking at night is bothersome, but not unbearable.
Pro Tip 2/3
Not Always Serious
'Bothersome' can refer to trivial things that are annoying but not harmful or serious. It's bothersome when people don't reply to texts promptly.
Pro Tip 3/3
Subjective Feel
What's bothersome can vary between people; it's based on personal tolerance. Some may find waiting bothersome, while others think of it as a chance to relax.