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1. 
[syn: hasty, overhasty, precipitate, precipitant, precipitous]
The Collaborative International Dictionary of English v.0.48:
Precipitant \Pre*cip"i*tant\, n. (Chem.)
   Any force or reagent which causes the formation of a
   precipitate.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Precipitant \Pre*cip"i*tant\, a. [L. praecipitans, -antis, p.
   pr. of praecipitare: cf. F. pr['e]cipitant. See
   Precipitate.]
   1. Falling or rushing headlong; rushing swiftly, violently,
      or recklessly; moving precipitately.
      [1913 Webster]
            They leave their little lives
            Above the clouds, precipitant to earth. --J.
                                                  Philips.
      [1913 Webster]
            Should he return, that troop so blithe and bold,
            Precipitant in fear would wing their flight. --Pope.
      [1913 Webster]
   2. Unexpectedly or foolishly brought on or hastened; rashly
      hurried; hasty; sudden; reckless. --Jer. Taylor.
      "Precipitant rebellion." --Eikon Basilike.
      [1913 Webster]
WordNet (r) 3.0 (2006):
precipitant
    adj 1: done with very great haste and without due deliberation;
           "hasty marriage seldom proveth well"- Shakespeare; "hasty
           makeshifts take the place of planning"- Arthur Geddes;
           "rejected what was regarded as an overhasty plan for
           reconversion"; "wondered whether they had been rather
           precipitate in deposing the king" [syn: hasty,
           overhasty, precipitate, precipitant, precipitous]
    n 1: an agent that causes a precipitate to form
Moby Thesaurus II by Grady Ward, 1.0:
43 Moby Thesaurus words for "precipitant":
   abrupt, accident-prone, breakneck, breathless, careless, desperate,
   devil-may-care, electrifying, furious, harum-scarum, hasty,
   headlong, hotheaded, hurried, impetuous, impulsive, mad,
   nerve-shattering, overeager, overenthusiastic, overzealous,
   panting, precipitate, precipitous, quick, rash, reckless, rushing,
   shocking, slap-bang, slapdash, speedy, startling, sudden,
   surprising, swift, unanticipated, unexpected, unforeseen,
   unlooked-for, unpredicted, wanton, wild