iron
- adjective (adj)
Meaning: hard, tough inflexible
Synonyms:
adamant
adamantine
cruel
dense
ferric
ferrous
firm
heavy
immovable
implacable
indomitable
inexorable
insensible
obdurate
relentless
rigid
robust
steel
steely
strong
stubborn
thick
unbending
unyielding
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.