horse·feath·ers 
(hôrsfĕth′ərs) Slang
(hôrsfĕth′ərs) Slang n. (used with a sing. verb)
Nonsense; foolishness.
interj.
Used to express disagreement or exasperation.
[Alteration of HORSESHIT.]
- unconquerable
- unconquerably
- unconscionable
- unconscionableness
- unconscionably
- unconscious
- unconsciously
- unconsciousness
- unconsidered
- unconsolable
- unconsolably
- unconsolidated
- unconstitutional
- unconstitutionality
- unconstitutionally
- unconstructed
- uncontaminated
- uncontested
- uncontrollability
- uncontrollable
- uncontrollableness
- uncontrollably
- uncontrolled
- uncontrolledness
- uncontroversial