denotes "voluntarily, willingly," Hebrews 10:26 , (of sinning) "willfully;" in 1 Peter 5:2 , "willingly" (of exercising oversight over the flock of God).
"to will," used in the present participle in 2 Peter 3:5 , is rendered "willfully (forget)" in the RV, AV, "willingly (are ignorant of)," lit., "this escapes them (i.e., their notice) willing (i.e. of their own will)." See WILL , C, No. 1, WILLING, B, No. 1.