hardened vs hard-boiled

hardened and hard-boiled both are adjectives.

Word	Noun	Adjective	Verb	Adverb
hardened	No	Yes	No	No
hard-boiled	No	Yes	No	No

As adjectives, hardened and hard-boiled are synonyms defined as:

Other synonyms of hardened include case-hardened.

hardened (adjective)	hard-boiled (adjective)
made hard or flexible or resilient especially by heat treatment	(eggs) cooked until the yolk is solid
protected against attack (especially by nuclear weapons)	used of persons; emotionally hardened
made tough by habitual exposure	tough and callous by virtue of experience
converted to solid form (as concrete)
used of persons; emotionally hardened