1. прил. кратк. форма от твердый
2. нареч. firmly, firm твердо стоять на ногах ≈ to be steady on one's legs твердо стоять на своем ≈ to stand one's ground (firmly) , to hold one's own, to stand firm он твердо решил уехать ≈ he is determined to go, he is determined on going;
he has firmly resolved to go, he has firmly on going твердо выучить ≈ learn thoroughly твердо держаться ≈ stand firm/fast твердо запомнить ≈ remember well твердо решить ≈ determine, resolve (to do smth.;
on doing smth.)
ad. firmly
Большой англо-русский и русско-английский словарь. 2001.