cavil

cavil [ KAV-uh'l ]
[ noun, intransitive verb, transitive verb ]

MEANING :
1. (tr. v.) to quibble about or raise inconsequential or frivolous doubts or objections
2. (tr. v.) to make petty objections or point out sham or minor discrepancies
3. (intr. v.) to raise trivial objections or unnecessarily find fault with
4. (n.) a frivolous and irritating objection
3. (n.) the act of making a frivolous objection

USAGE EXAMPLE 1 :
The little boy grumbled that he could never please his parents as they cavilled about everything he did.
USAGE EXAMPLE 2 :
Purists who shudder at the historical doubtfulness of the Uzbek-Timur connection may also cavil at the Tajiks' claims.