objecting (?.)

• complaining
• disputatious
• disputing
• dissentient
• dissenting
• expostulative
• expostulatory
• fractious
• noncooperative
• obstructive
• on the barricades
• proof against
• protestant
• protesting
• rebellious
• recalcitrant
• refractory
• reluctant
• remonstrant
• remonstrative
• renitent
• repellent
• resistant
• resisting
• resistive
• retardant
• retardative
• uncooperative
• under protest
• unsubmissive
• unyielding
• up in arms
• withstanding