indefinite
1. [ adjective ] vague or not clearly defined or stated
Examples:

"must you be so indefinite?" "amorphous blots of color having vague and indefinite edges" "he would not answer so indefinite a proposal"

Related terms: definite one indecisive nebulous coy undefined indistinct unclear
2. [ adjective ] not decided or not known
Examples:

"were indefinite about their plans" "plans are indefinite"

Related terms: uncertain
Similar spelling:   indefinitely
  indefinity
  indefinable