onerously Definition

onerous
adj

1. Heavy; difficult to do or bear; oppressive.

Thesaurus: oppressive, difficult, demanding, laborious, taxing, formidable, arduous, gruelling, tedious, heavy, hard, harsh.
2. law.
Said of a contract, etc: with or involving a legal burden or obligation.

Derivative: onerously
adverb

Derivative: onerousness
noun

Etymology: 14c: from Latin onerosus, from onus burden.