"firm, steadfast, secure" (from baino, "to go"), is translated "firm" in Hebrews 3:6 , of the maintenance of the boldness of the believer's hope, and in Hebrews 3:14 , RV, of "the beginning of our confidence" (AV, "steadfast"). See STEADFAST , SURE.

2: στερεός

(Strong's #4731 — Adjective — stereos — ster-eh-os' )

"solid, hard, stiff," is translated "firm" in 2 Timothy 2:19 , RV, "the firm (foundation of God)," AV, "(standeth) sure;" stereos is not part of the predicate; "solid (food)" in Hebrews 5:12,14 , RV; "steadfast" in 1 Peter 5:9 . See SOLID , STEADFAST , STRONG.

Note: Cp. stereoo, "to make strong, establish," Acts 3:7,16; 16:5 , and stereoma, "steadfastness," Colossians 2:5 .

Bibliography Information
Vines, W. E., M. A. Entry for 'Firm'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/f/firm.html. 1940.

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Vine's Expository Dictionary of NT Words

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Firm