You can often tell someone is Flemish rather than Dutch by their pronunciation, word choices, and some grammar habits. Flemish speakers typically have a softer, less guttural G and CH sound, use distinct vocabulary like 'goesting' (desire) or 'ambetant' (annoying), and may employ different word order or verb forms. These clues are not absolute, but together they usually give away a Belgian origin.
Pronunciation The most immediate giveaway is the pronunciation of the letters G and CH. In the Netherlands, these are pronounced as a harsh, throaty sound (like clearing your throat). In Flanders, they are much softer, often closer to an H or a gentle fricative. Vowels also differ: Flemish speakers tend to pronounce 'ij' and 'ei' more like a diphthong similar to 'ay' in 'say', while Dutch speakers often use a wider, more open sound. The 'r' is another clue: Flemish speakers often roll or tap the r, while many Dutch speakers use a uvular r (from the throat).
Vocabulary Flemish uses many words that are uncommon or absent in the Netherlands. Examples include 'goesting' (desire, craving), 'ambetant' (annoying), 'courgette' (zucchini), 'plezant' (fun), and 'schoen' (shoe, whereas Dutch speakers often say 'schoen' for a dress shoe but 'sportschoen' for sneaker). Flemish also uses 'gij' or 'ge' for 'you' (informal singular) instead of 'jij' or 'je', and 'u' as a subject pronoun. In the Netherlands, 'gij' is archaic or dialectal. Another common difference: Flemish speakers say 'beenhouwer' for butcher, while Dutch say 'slager'.
Grammar and word order Flemish often uses different word order in subordinate clauses or with modal particles. For instance, Flemish speakers might say 'Ik heb dat niet gedaan' (same as Dutch) but use 'ge' instead of 'je' in inversion: 'Hebt ge dat?' versus 'Heb je dat?'. Flemish also tends to use 'zich' differently in reflexive verbs, and the past participle of some verbs can differ (e.g., 'geweest' vs 'geweest' is same, but 'gezien' vs 'gezien' is same; better example: 'gehad' vs 'gehad' is same). A more reliable grammar clue is the use of 'gij' and its verb forms: 'gij zijt' (you are) instead of 'jij bent'.
Practical tips Listen for the soft G first. Then check for 'gij/ge' and typical Flemish words. If you hear 'goesting' or 'ambetant', it's almost certainly Flemish. However, many Dutch people from the south (North Brabant, Limburg) also have soft G and may use some Flemish-like words, so context matters. If you want to improve your ear, try Dutch Fluency for structured listening practice. Start by watching Belgian and Dutch TV shows side by side, and note the differences. Over time, you'll recognize the patterns instinctively.