Refusing or likely to refuse to proceed, act, or function as directed or expected

ETYM From Difficulty.
1. Not easy; requiring great physical or mental effort to accomplish or comprehend or endure; SYN. hard.
2. Requiring much effort and trouble.

ETYM Cf. Prov. Eng. frack forward, eager, Eng. freak, fridge; or Prov. Eng. fratch to squabble, quarrel.
1. Stubbornly resistant to authority or control; SYN. refractory.
2. Unpredictably difficult in operation; likely to be troublesome.
Irritable; peevish.

1. Not easily restrained; ungovernable; obstinate; stubborn.
2. Directed by ungovernable will, or proceeding from obstinacy.

ETYM Latin indocilis: cf. French indocile. Related to In- not, and Docile.
Of persons; SYN. uncontrollable, ungovernable, unruly.

ETYM Old Fren. restif, French rétif, from Latin restare to stay back, withstand, resist. Related to Rest remainder, and cf. Restiff.
Impatient especially under restriction or delay.
Fidgety; uneasy; obstinate; unmanageable; refusing to go forward.

ETYM Old Eng. stoburn, stiborn; probably from as. styb a stub. Related to Stub.
1. Difficult to treat or deal with.
2. Tenaciously unwilling or marked by tenacious unwillingness to yield.

Ungovernable, unmanageable, disobedient, rebellious
Not submissive; disregarding restraint and ungovernable

ETYM Old Fren. vicious, French vicieux, from Latin vitiosus, from vitium vice. Related to Vice a fault.
1. Bitter; spiteful; malignant.
2. Addicted to vice; corrupt in principles or conduct; depraved; wicked.
3. Characterized by vice or defects; defective; faulty; imperfect.
4. Not correct or pure; corrupt or heinous.