Querulant — meaning in English

English meaning

deviant adj Different from what is normal or expected, especially in a way society disapproves of.
eccentric adj Behaving in an unconventional or slightly odd way; not following normal habits.
gadfly noun A fly, such as a botfly or horsefly, that bites animals and feeds on their blood, irritating them.
recalcitrant adjective Stubbornly refusing to obey authority, follow rules or cooperate, even under pressure.
troublemaker noun Someone who deliberately causes problems or stirs up conflict.

Querulant is used for these senses in English:

barrator One who is guilty of barratry, vexing others with frequent and often groundless lawsuits; a brangler and pettifogger.
deviant A person who deviates, especially from norms of social behavior.
eccentric One who does not behave like others.
fussbudget (colloquial, derogatory, North America) One who complains or fusses a great deal, especially about unimportant matters; a fusspot.
querulant (psychology) One who has obsessive feelings of having been wronged.
recalcitrant A person who is recalcitrant.
troublemaker One who causes trouble, especially one who does so deliberately.

adj Different from what is normal or expected, especially in a way society disapproves of.
noun A person whose behavior clearly breaks accepted social norms.

adj Behaving in an unconventional or slightly odd way; not following normal habits.
adj Not centered on the same point as something else; off-center.
noun A person whose behavior or habits are unusual or quirky.