Infantile; childish.
Emerging; just coming into existence.
Of the state of an element at the time it is being generated from some compound or transitioning from one state to another; Newly released from a compound (especially hydrogen and oxygen) by a chemical reaction or electrolysis and possessing heightened reactivity; Newly synthesized (especially protein or RNA) by translation or transcription.
Describing the state, aspect, or practice of an abstract concept.