adj. (ier, lest) 1 outgoing, welldisposed, kindly. 2 a (often foil. by with) on amicable terms. b not hostile. 3 (in comb.) not harming; helping (ozonefriendly; userfriendly). 4 = USERFRIENDLY. a. (pl. ies) = FRIENDLY MATCH. adv. in a friendly manner. CI friendliness n.