The present study aims to reveal some facts concerning first language (L[subscript 1]) and second language (L[subscript 2]) spoken-word processing in unbalanced proficient bilinguals using behavioral measures. The intention here is to examine the effects of auditory repetition word priming and semantic priming in first and second languages of these bilinguals. The other goal is to explore the effects of attention manipulation on implicit retrieval of perceptual and conceptual properties of spoken L[subscript 1] and L[subscript 2] words. In so doing, the participants performed auditory word priming and semantic priming as memory tests in their L[subscript 1] and L[subscript 2]. In half of the trials of each experiment, they carried out the memory test while simultaneously performing a secondary task in visual modality. The results revealed that effects of auditory word priming and semantic priming were present when participants processed L[subscript 1] and L[subscript 2] words in full attention condition. Attention manipulation could reduce priming magnitude in both experiments in L[subscript 2]. Moreover, L[subscript 2] word retrieval increases the reaction times and reduces accuracy on the simultaneous secondary task to protect its own accuracy and speed.