/fayn/ , adv.
1. gladly; willingly: He fain would accept.
adj.
2. content; willing: They were fain to go.
3. Archaic. constrained; obliged: He was fain to obey his Lord.
4. Archaic. glad; pleased.
5. Archaic. desirous; eager.
[ bef. 900; ME; OE faeg ( e ) n; c. ON feginn happy; akin to FAIR 1 ]