thefly

• þeefly, þeofliche, þefliche, þeefliche, þeflich, thevelich, þeefli, theffly, þevely, theefly

From thef +‎ -ly.

• IPA^(key): /ˈθeːfliː/, /ˈθeːvliː/, /ˈθeːfliːtʃ(ə)/

thefly

1. In a way resembling a thief; thievishly (especially referring to deception or sleight-of-hand)

   (Can we find and add a quotation of Chaucer to this entry?)

• English: thiefly (now rare)

• “thẹ̄flī, adv.”, in MED Online, Ann Arbor, Mich.: University of Michigan, 2007, retrieved 21 October 2018.