noncommittal

Etymology

non- + committal

adj

1. Tending to avoid commitment; lacking certainty or decisiveness; reluctant to give out information or show one's feelings or opinion.
   The Major's face was noncommittal.
   The noncommittal Indians would give no counsel as to fording.
   [He] is candid, open-hearted, and hardly non-commmittal enough for his own interest at times. 1818, S.R. Wells, The American Phrenonological Journal, and other miscellany, volume 10, page 234
   A United Nations spokesman, Stéphane Dujarric, has previously said the organization would not divulge its sources of information, but welcomed any additional information from the coalition. The United Nations has been noncommittal on the Saudi proposal to send its experts to Riyadh. 2016-06-22, Somini Sengupta, “Saudis Question U.N. Leader Over Report on Rights Violators”, in The New York Times

noun

1. Failure to commit to a decision or course of action.
   As a result of cowardly noncommittals during the immediate postelection period, there was so much strain on several black-white Democratic relationships that they approached open ruptures. 1997, Dennis Sven Nordin, The New Deal's Black Congressman, page 42
2. A voter etc. who has not yet committed to a decision.
   Where they occur, in the Liberal increases in Quebec and Ontario for instance, they are offset by declines in the number of undecideds or noncommittals. 1981, Howard Rae Penniman, Canada at the Polls, 1979 and 1980, page 372