anxious; worried; apprehensive
焦 · 12 strokes
Originally a pictograph of a wren. Based on the original meaning "wren", now written as 鷦. Later used as a phonetic loan for "burn", after which the fire (灬) component was added.
虑 · 10 strokes
Simplified form of 慮. Phonosemantic compound. 思 represents the meaning and 虍 represents the sound.