v. 1
To trouble, to bother, to annoy.
The unlucky boy was hassled by a gang of troublemakers on his way home.
v. 2
To pick a fight or start an argument with.
v. 3
To work through something troublesome; to be bothered by.
If you don't want to hassle through converting formats, you'll have to stick with one program.
n. 1
Trouble, bother, unwanted annoyances or problems.
I went through a lot of hassle to be the first to get a ticket.

Related words

Forms

Plural: hassles → quibbles, disputes, controversies, tussles…
Past participle: hassled
e.g. hassled → troubled, bothered, bugged, annoyed…

Use in printed books, per decade from 1850 to 2019.

3 letters: bug¹, vex¹, irk¹
4 letters: stir¹, fuss¹, fret¹
5 letters: storm¹, harry², grind¹, annoy², chevy², brawl¹, beset², peeve¹
6 letters: bother², plague¹, harass², uproar², ruckus², molest², tumult², pester², tussle², fracas²
7 letters: trouble², dispute², disturb², provoke², quarrel², scuffle², quibble², wrangle², ruction
8 letters: argument³, nuisance², irritate³, squabble²
9 letters: commotion³, bickering³, aggravate³
10 letters: exasperate⁴
11 letters: controversy⁴, disturbance³, altercation⁴

The small number after each word is its number of syllables (harry² = 2 syllables).