Biodegradable: readily broken down or rotted.
Confine: to keep or hold within limits.
Ecstacy: very great happiness.
Grave: important, worthy of being deeply considered.
Inflammation: a hot, red sore swelling part of the body.
Monotonous: having little or no change.
Primitive: of or belonging to earliest times.
Reel: to walk or move unsteadily.
Remnant: what's left over.
Trial: the act of trying or testing.