mlohav

1. limp; flabby; slack
   Posle bolesti mišići su mu bili mlohavi. — After his illness his muscles were flabby.
   Pružio mi je mlohavu ruku. — He offered me a limp hand.
2. (of actions, play, reactions) sluggish; feeble; half-hearted
   Igra našeg tima bila je mlohava i bez ideja. — Our team's play was sluggish and uninspired.

In Serbia mlitav is more common in the same meaning.