loath
Concise Oxford English Dictionary © 2008 Oxford University Press:
loath /ləʊθ/ (also loth)
▶adjective reluctant; unwilling: I was loath to leave.
– origin OE lāth ‘hostile’, of Gmc origin.
usage: Do not confuse loath and loathe. Loath is an adjective meaning ‘reluctant or unwilling’, as in I was loath to leave, whereas loathe is a verb meaning ‘feel hatred or disgust for’, as in she loathed him on sight.
'loath' also found in these Oxford entries:

