1 hard

2 stiff

3 strong

4 firm

5 resolutely

6 doggedly

7 good (quality)

8 able (person)

1 stiff

2 rigid

1 reluctant to admit a mistake

1 hard

2 solid

1 tough

2 unyielding

3 hard-line

1 lit. eats soft food, but refuses hard food (idiom)

2 amenable to coaxing but not coercion

1 to coax and pester (idiom)

2 to wheedle

3 to cajole

1 to force oneself upon sb (idiom)

2 to rape