adjective
1.
capable of being defended against attack
the platoon's position was no longer tenable
Synonyms: defendable, defensible
Related Word: impregnable, secure
Contrasted words: insecure, vulnerable; defenseless, helpless, unprotected; dangerous, precarious, risky
Antonyms: untenable
2.
Synonyms: justifiable , condonable, defensible, excusable, vindicable, warrantable
Related Word: believable, credible, maintainable, plausible
Contrasted words: indefensible, inexcusable, unbelievable, unjustifiable
Antonyms: untenable