Ge-unclǽnsian

According to the Old English Dictionary:

ge-unclǽnsian

to make unclean, to pollute; fœdare :-- Romulus hiora angin geunclǽnsode mid his bróðor slege Romulus polluted their under-taking with his brother's murder, Ors. 2, 2; Bos. 40, 30. ge-unclænsian