✅ Rarely means something happens only occasionally, not often (She rarely goes out to eat).

✅ Infrequently also means happening occasionally or at wide intervals, but it can refer to something more measured or scheduled (The train runs infrequently during the holidays, so passengers often wait a long time).

✅ Both words describe events that don’t happen often.

✅ Rarely tends to describe spontaneous, irregular events, while infrequently tends to be more formal and can apply to planned activities that don’t occur often (I rarely take sick days at work; The meeting is held infrequently, scheduled once a quarter).

✅ Fragile means easily broken or damaged (The fragile vase shattered when it fell).

✅ Frangible refers to something that is breakable or prone to breaking under pressure (Frangible materials are often used in safety tests because they break upon impact).

✅ Both words describe things that can be easily broken.

✅ Fragile is more commonly used for delicate objects, while frangible is more technical, often used in scientific or safety contexts (The fragile glass was carefully wrapped; Frangible bullets are designed to shatter on impact).

✅ Trait refers to a characteristic or quality that defines someone's personality or behavior (Honesty is an admirable trait).

✅ Mannerism is a habitual or distinctive way of behaving or speaking, often unconscious (My habit of twirling my pen is a peculiar mannerism).

✅ Both words refer to behaviors or qualities of a person.

✅ Trait describes inherent qualities or characteristics, while mannerism refers more specifically to small, repeated behaviors (Kindness is your best trait; His mannerism of tapping his foot made him look nervous).