Neutral:
* Uninspired: This suggests a lack of creative spark.
* Unoriginal: This implies a lack of new or unique ideas.
* Practical: While not negative, this can sometimes imply a focus on the tangible and concrete, leaving little room for flights of fancy.
* Literal: This describes someone who takes things very literally and struggles with abstract thinking.
Negative:
* unimaginative: This is a straightforward and direct way to describe a lack of imagination.
* Uninventive: This suggests a lack of creativity and resourcefulness.
* Dull: This word suggests a lack of excitement and interest.
* Prosaic: This implies a lack of imagination and excitement.
* Pedestrian: This describes someone who is commonplace and lacks originality.
* Bland: This suggests a lack of personality or excitement.
* Uninspired: This implies a lack of creative spark.
* Conventional: This describes someone who adheres to traditional norms and avoids originality.
More informal:
* Boring: This is a simple and straightforward way to describe someone lacking imagination.
* Plain Jane/John: This implies a lack of flair and originality.
The best word to use will depend on the specific context and the tone you want to convey.