rational adj.
VERBS be, seem It all seemed quite rational to me.
ADV. highly, very | entirely, fully, perfectly, quite At the time she was perfectly rational. | purely, strictly | essentially Humans are essentially rational beings. | apparently | economically With children working from the age of ten, large families were economically rational.
PREP. about Try to be rational about it.
You can also check other dicts: rational (English, 中文解释 ), wordnet sense, Collins Definition