problematic

a.有疑问的，疑难的，未定的

pro forma, pro forma (also pro forma invoice), pro or con, pro rata, pro tem, pro-, probability, probable, probably, probate, probation, probation officer, probationary, probationer, probe, probing, probingly, probity, problem, problem child, problematically, proboscis, procedural, procedure, proceed, proceeding, proceedings, proceeds, process, processing, procession, processional, processor, proclaim, proclamation, proclivity, procrastinate, procrastination, procrastinator, procreate,