hardened

As a verb hardened

is (harden).

As an adjective hardened

is unfeeling or lacking emotion due to experience; callous.

As a numeral set is

seven.

As verbs the difference between hardened and tempered

is that hardened is (harden) while tempered is (temper).

As adjectives the difference between hardened and tempered

is that hardened is unfeeling or lacking emotion due to experience; callous while tempered is of one's disposition.

As adjectives the difference between practical and hardened

is that practical is based on practice or action rather than theory or hypothesis while hardened is unfeeling or lacking emotion due to experience; callous.

As a noun practical

is a part of an exam or series of exams in which the candidate has to demonstrate their practical ability.

As a verb hardened is

past tense of harden.

Untouched is a related term of hardened.

As adjectives the difference between untouched and hardened

is that untouched is remaining in its original, pristine state, undamaged while hardened is unfeeling or lacking emotion due to experience; callous.

As a verb hardened is

(harden).

Uninterested is a related term of hardened.

As adjectives the difference between uninterested and hardened

is that uninterested is (obsolete) unmotivated by personal interest; unbiased, disinterested while hardened is unfeeling or lacking emotion due to experience; callous.

As a verb hardened is

(harden).

As verbs the difference between toughen and hardened

is that toughen is to make tough while hardened is (harden).

As an adjective hardened is

unfeeling or lacking emotion due to experience; callous.

Hardened is a synonym of insensible.

As adjectives the difference between hardened and insensible

is that hardened is unfeeling or lacking emotion due to experience; callous while insensible is unable to be perceived by the senses.

As a verb hardened

is (harden).