Dylan Thomas is deeply influenced by French Symbolists and has connotatively used symbols in his poetry to blend the complexity of religious and sexual images which creates ambiguity and metaphysical nature of words. Symbols are not only connotative but also evocative and emotive. They evoke before the mind's eye a host of associations connected with them and are also rich in emotional significance. It is emotive conveying the "pure sensations" or the poet's apprehension of transcendental mystery. This research paper attempts to analyse the types of imagery used by Dylan Thomas in his poetry which in one way contributes the connotative meaning of the poetry but in other way leads to ambiguity and complexity leading to layers of meanings.