Meanings

honest

hard charcoal

hardwood

(the Christian sacrament of) confirmation

solidly built person

possessed of a strong sense of duty

hard biscuits

sound business

iron purpose

hard wood

strength

being faithful to one's principles

(a fortress being) impregnable

strong determination

sophism

dogged perseverance

firm and solid

of strict morals (moral principles)

being of firm (unshakable) faith and strict practice

very cautious (watchful, vigilant)