| AIRTIGHTNESS | • airtightness n. The quality of being airtight. • AIRTIGHTNESS n. the quality of being airtight. | 
| BRIGHTNESS | • brightness n. The quality of being bright. • brightness n. The perceived luminance of an object. • brightness n. Intelligence, cleverness. | 
| DOWNRIGHTNESS | • downrightness n. The personal quality of being straightforward and direct in one’s manner. • DOWNRIGHT n. plainspoken, blunt. | 
| FORTHRIGHTNESS | • forthrightness n. The characteristic or quality of being forthright. • FORTHRIGHTNESS n. the state of being forthright. | 
| GASTIGHTNESS | • gastightness n. The quality of being gastight. • GASTIGHTNESS n. the state of being gastight. | 
| LIGHTNESS | • lightness n. (Uncountable) the condition of being illuminated. • lightness n. (Uncountable) the relative whiteness or transparency of a colour. • lightness n. (Countable) The product of being illuminated. | 
| RIGHTNESS | • rightness n. (Uncountable) The characteristic of being right; correctness. • rightness n. (Countable) The result or product of being right; something correct. • rightness n. The property of being on, or moving toward, the right. | 
| SLIGHTNESS | • slightness n. The property of being slight, smallness, petiteness. • SLIGHTNESS n. the state of being slight. | 
| STEAMTIGHTNESS | • STEAMTIGHTNESS n. the state of being steamtight. | 
| STRAIGHTNESS | • straightness n. (Uncountable) The state or quality of being straight (especially in the sense of "heterosexual"). • straightness n. (Countable) The result or product of being straight. • STRAIGHTNESS n. the state of being straight. | 
| TIGHTNESS | • tightness n. The quality or degree of being tight. • TIGHTNESS n. the state of being tight. | 
| UPRIGHTNESS | • uprightness n. (Uncountable) The state of being honest, honourable, and moral. • uprightness n. (Uncountable) The state of being erect or vertical. • uprightness n. (Countable) The product or result of being upright. | 
| UPTIGHTNESS | • uptightness n. The state or quality of being uptight. • UPTIGHTNESS n. the state of being uptight. | 
| WATERTIGHTNESS | • watertightness n. (Rare) The condition of being watertight. • WATERTIGHTNESS n. the state of being watertight. |