IPA: /ˈstiːliər/
KK: /ˈstiːliər/
Having a strong, hard, or cold quality, often associated with steel; more intense or severe than something that is steely.
Her steelier gaze made him feel uneasy during the meeting.
Comparative: steelier
Superlative: steeliest
The word 'steelier' is derived from 'steel' (from Old English 'stæle', meaning a hard, strong metal) combined with the comparative suffix '-ier' (meaning more). Thus, 'steelier' means more like steel or having the qualities of steel to a greater degree.
Think of 'steel' as a strong metal, and remember that 'steelier' means having more of that strength or quality.