资料来源 : pyDict

不定词的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Infinitival \In*fin`i*ti"val\, a.
   Pertaining to the infinite mood. ``Infinitival stems.''
   --Fitzed. Hall.

资料来源 : WordNet®

infinitival
     adj : relating to or formed with the infinitive; "infinitival
           clause"