Search Result for "onerousness": 
Wordnet 3.0

NOUN (1)

1. unwelcome burdensome difficulty;
[syn: burdensomeness, heaviness, onerousness, oppressiveness]


WordNet (r) 3.0 (2006):

onerousness n 1: unwelcome burdensome difficulty [syn: burdensomeness, heaviness, onerousness, oppressiveness]