{"era":"current","word":"careful","meaning":"exercising caution","children":[{"era":"pre-1100 + current","word":"care + -ful","meaning":"sorrow, anxiety + full of","children":[{"era":"1200s","word":"careful","meaning":"full of care, anxious","children":[{"era":"pre-1100","word":"caru","meaning":"sorrow, anxiety, burden","children":[],"language":"Old English"}],"language":"Middle English"}],"language":"Old English + English"}],"language":"Modern English"}