
1) Dishonest 2) Dishonorable 3) Given to thievery 4) Not to be trusted 5) Thieving 
Found on 
https://www.crosswordclues.com/clue/thievish

1) Dishonest 2) Piratical 3) Thieving 
Found on 
https://www.crosswordclues.com/clue/thievish

• (a.) Given to stealing; addicted to theft; as, a thievish boy, a thievish magpie. • (a.) Like a thief; acting by stealth; sly; secret. • (a.) Partaking of the nature of theft; accomplished by stealing; dishonest; as, a thievish practice.
Found on 
http://thinkexist.com/dictionary/meaning/thievish/

1. Given to stealing; addicted to theft; as, a thievish boy, a thievish magpie. ... 2. Like a thief; acting by stealth; sly; secret. 'Time's thievish progress to eternity.' (Shak) ... 3. Partaking of the nature of theft; accomplished by stealing; dishonest; as, a thievish practice. 'Or with a base and biosterous sword enforce A thievish living on t...
Found on 
http://www.encyclo.co.uk/local/20973
 Thiev'ish  adjective   1.
Thiev'ish  adjective   1.  Given to stealing; addicted to theft; as, a 
 thievish boy, a 
 thievish magpie.  
 2.  Like a thief; acting by stealth; sly; secret. « Time's 
 thievish progress to eternity.» 
 Shak.   3.  Partaking of the nature of theft;...
Found on 
http://www.encyclo.co.uk/webster/T/44
  No exact match found.