The term 'not friendly' can be described in a variety of ways, including 'COOL' (4 letters), 'ICY' (3 letters), 'HUFFY' (5 letters), 'GLACIAL' (7 letters), 'ALIENATED' (9 letters), 'uncongenial' (11 letters), and 'UNCOOPERATIVE' (13 letters). These words all describe a lack of warmth or friendliness, ranging from a mild chilliness to outright hostility. COOL and ICY suggest a lack of warmth, while HUFFY implies annoyance or anger. GLACIAL implies a coldness that is almost impenetrable, while ALIENATED and uncongenial suggest a feeling of being disconnected or isolated. Finally, UNCOOPERATIVE implies a refusal to cooperate or work together. All of these words describe a lack of friendliness or warmth.