1 obstinate

2 stubborn

1 to fix

2 to fasten

3 to set rigidly in place

4 fixed

5 set

6 regular

1 cholesterol

1 to freeze

2 to solidify

3 to congeal

4 fig. with rapt attention

1 to reinforce (a structure)

2 to strengthen

1 secure as a city protected by a wall of metal and a moat of boiling water (idiom)

2 well fortified

3 invulnerable to attack

1 to choose what is good and hold fast to it (idiom)

1 deep, closed and refusing (idiom); obstinate

2 stubborn and perverse