unmanly

Short definition from Wiktionary

Adjective

1. 1
   Showing characteristics that are not manly, such as being immature, effeminate or cowardly, which might be construed as an indicator of weakness or of baseness of character.
2. 2
   Of or pertaining to something not human.
3. 3
   Cowardly, base.
4. 4
   Not acceptable from a man.
5. 5
   Not becoming of a man.

Adverb

1. 1
   In a manner that is unmanly.