
1) Blunt 2) Deaden 3) To dull 4) To mitigate 
Found on 
https://www.crosswordclues.com/clue/obtund

1) Blunt 
Found on 
https://www.crosswordclues.com/clue/obtund

to blunt or dull; to deaden
Found on 
http://phrontistery.info/o.html

• (v. t.) To reduce the edge, pungency, or violent action of; to dull; to blunt; to deaden; to quell; as, to obtund the acrimony of the gall.
Found on 
http://thinkexist.com/dictionary/meaning/obtund/

To dull or blunt, especially to blunt sensation or deaden pain. ... Origin: L. Ob-tundo, pp. -tusus, to beat against, blunt ... (05 Mar 2000) ... 
Found on 
http://www.encyclo.co.uk/local/20973

(ob-tund´) to render dull, blunt, or less acute, or to reduce alertness.
Found on 
http://www.encyclo.co.uk/local/21001
 Ob·tund'  transitive verb
Ob·tund'  transitive verb [ 
 imperfect & past participle   Obtunded ; 
 present participle & verbal noun   Obtunding .] [ Latin 
 obtundere , 
 obtusum ; 
 ob (see 
 Ob- ) + 
 tundere to strike or beat. See 
 Stutte...
Found on http://www.encyclo.co.uk/webster/O/7
 Type: Term Pronunciation: ob-tŭnd′ Definitions: 1. To dull or blunt, especially to blunt sensation or deaden pain.
Type: Term Pronunciation: ob-tŭnd′ Definitions: 1. To dull or blunt, especially to blunt sensation or deaden pain.
Found on http://www.medilexicon.com/medicaldictionary.php?t=62073
 Obtund: To dull or blunt. From the Latin obtundere, to blunt.
Obtund: To dull or blunt. From the Latin obtundere, to blunt.
Found on http://www.medterms.com/script/main/art.asp?articlekey=26269
 [v] - reduce the edge or violence of
[v] - reduce the edge or violence of
Found on http://www.webdictionary.co.uk/definition.php?query=obtund
  No exact match found.