The word "most conceptive" refers to something that is highly innovative or creative. Its antonyms include uncreative, dull, unimaginative, conventional, and non-inventive. Uncreative refers to lack of originality or imagination in generating ideas or solutions. Dull denotes a lack of vibrancy, energy or excitement. Imaginative portrays something innovative, resourceful or creative. Conventional implies conformity to accepted norms, standards or practices. Non-inventive refers to stagnation, lack of novelty, or unoriginality in ideas or approach. Although the antonyms of "most conceptive" depict different shades of negativity, they help describe the opposite of an innovative, original or creative idea.