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| decision (InnaKr); grip (InnaKr); assurance; assuredness; fastness; firmness; fixedness (про наміри); hardness; iron; resolution (рішучість); rigidity; solidity; stability (характеру тощо); steel; strength (про принципи); substance; sureness; toughness; backbone; consistency; constancy; grit (про характер) | |||
| resolution; steadiness | |||
| hardness | |||
| granite (характеру тощо) | |||
| tack | |||
| stiffness | |||
| conical indentation hardness; hardness (води); inflexibility; wear hardness | |||
| adamant | |||
| твердість: 110 phrases in 12 subjects |
| Airports and air traffic control | 1 |
| Chemistry | 7 |
| Construction | 1 |
| General | 8 |
| Industry | 2 |
| Informal | 2 |
| Metallurgy | 8 |
| Microelectronics | 6 |
| Military | 4 |
| Oil and gas | 67 |
| Philosophy | 1 |
| Technology | 3 |