This is not a word that is generally used in a normal day to day conversations. Songs/poems use it mostly. It may mean- charming, captivating,pleasing, likable, savoury e.g. दिलकश नज़ारा

मुझे उसकी अदाऐं दिलकश लगती हैं । (mujhe uskii adaaen dilkash lagtii hain) English: I find her graceful style attractive हिमालय की बर्फ़ीली चोटियों के दिलकश नज़ारे देख कर दिल को चैन मिला । Himaalay kii barfiilii chotiyon ke dilkash nazaare dekh kar dil to chain milaa English : I found peace/solace looking at the attractive vista of snow capped Himalayan peaks. dilkash (attractive) is Persian loan word into Hindi