1 Old HSK word(s): 
☊思索 ** C
不假思索* *
Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.
不 no, not / un- / negative prefix
假 falsehood, deception / vacation
思 think, consider, ponder / final particle
索 large rope, cable / rules, laws / to demand, to exact / to search, inquire / isolated
Hsk Characters:
HSK -Characters and beyond:
| Gb | Big5 | Eng | Rad | Mega | Triple | Multilingual |
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(tief, gründlich) nachdenken (V)abwägen, erwägen, beurteilen (V) [si1 suo3] 
思索
bereit, fertigohne zu zögern [bu4 jia1 si1 suo3] 不加思索
prompt (Adj) [bu4 jia3 si1 suo3 de5] 不假思索地
tüfteln (V) [ku3 ku3 si1 suo3] 苦苦思索
