Or cautious.
Careful.
careful
careful; responsible
Accountable, trustworthy, careful, responsible, liable, reliable...
Frantically means in a confused and reckless manner or state. Its opposite word (or antonyms) could be:calmly,collectedly,composedly,coolly (or cooly),imperturbably,peacefully,unconcernedly,mildly, ortamely.
The opposite of reckless would be cautious or careful.
reckless
Reckless behavior in science is opposite of ethical.
reckless behavior risk taking
reckless, careless, clumsy, and probley some other things
Careful.
Antonyms of careful that have that kind of C are capricious, injudicious, nonchalant, and unconcerned.
Careless, foolish, idiotic, stupid, ignorant, senseless, irrational, thoughtless, uneducated, or reckless. Those words are the opposite of wise.
careful
careful; responsible
Opposite for offhand: "calculated, careful, considered, deliberate, planned"
Careful. Also heedful or diligent.careful