gives over to (verb) buckle down: work very hard
Sinonime: alert,
attentive, cagey, calculating,
canny, chary, circumspect, considerate, discreet, distrustful, doubting,
frugal, gingerly,
guarded, handling with kid gloves, heedful, keeping on one's toes, leery, on guard, on the lookout, on the qui vive, provident, prudent, safe,
saving,
sly, sparing,
suspicious, thinking twice,
thrifty, unwasteful, vigilant, walking on eggs, watchful, watching one's step, watching out, wide-awake
Antonime: careless,
foolish, heedless, incautious, indiscreet, rash,
reckless