The best replacement for manic is hypomanic.

The best alternatives to manic are rated as following:
★★★★★  hypomanic
★★★★  mania
★★★  bipolar
★★  hypomanic episode
★  maniac
★  clinical depression
★  scourge
★  psychotic
  major depression
  hypomanic episodes
  maniacal
  depressive disorder
  panic
  hypomania
  depressive
  chronic depression
  hypo manic

Your alternative for manic is not listed? Suggest!
Speaking about manic, one probably shouldn't forget about bipolar.

Other search terms related to manic and their ratings are:
★★★★★ bipolar
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