cav·il 
(kăvəl)
(kăvəl)v. cav·iled, cav·il·ing, cav·ils also cav·illed or cav·il·ling
v.intr.
To argue or find fault over trivial matters; raise petty objections. See Synonyms at quibble.
v.tr.
To quibble about; point out petty flaws in.
n.
A carping or trivial objection.
[French caviller, from Old French, from Latin cavillārī, to jeer, from cavilla, a jeering.]
cavil·er n.