hard-as-nails (adjective) determined: driven, persistent
Sinonime: biologic,
cure, depressant,
dope*,
essence, medicament, medicinal, medicine, narcotic, opiate, pharmaceutic, pharmaceutical, physic, pill,
poison, potion, prescription, remedy, sedative, stimulant, tonic
Antonime: flexible, hesitating,
irresolute,
vacillating,
wavering,
weak