1cool 
/ˈku:l/ adjective
cool·er; cool·est /ˈku:l/ adjective 1 [or more cool; most cool] : somewhat cold : not warm or hot
▪ a cool breeze ▪ The weather is cool today. ▪ The surface is cool to the touch. ▪ The plant grows best in cool climates. ▪ I'm feeling a little cool. ▪ a cool refreshing drink ▪ It's cooler [=less warm or hot] in the shade. ▪ This is the coolest [=least warm or hot] summer on record. 2 : made of a light, thin material that helps you stay cool
▪ We changed into some cooler clothes. 3 [or more cool; most cool] : able to think and act in a calm way : not affected by strong feelings
▪ It is important to keep a cool head in a crisis. = It is important to keep/stay cool in a crisis. [=it is important to remain calm in a crisis] ▪ She remained calm, cool, and collected. ▪ He is a cool customer. [=he is someone who remains calm and is not easily upset] ◊If you are (as) cool as a cucumber, you are very calm and able to think clearly often in a difficult situation.
▪ Even in the emergency, she remained as cool as a cucumber. ▪ The reporter was cool as a cucumber despite the confusion all around her. 4 [or more cool; most cool] : not friendly
▪ a cool reply ▪ He replied with a cool “I don't think so.” ▪ She was always cool toward strangers. ▪ We were surprised by the cool reception we got. 5 [or more cool; most cool] informal a : very fashionable, stylish, or appealing in a way that is generally approved of especially by young people
▪ cool sunglasses ▪ The car has a cool new look. ▪ You look cool in those jeans. ▪ a magazine article about the coolest places to live/work — often used to show approval in a general way ▪ Your brother is so cool. ▪ That was a really cool [=good, excellent] movie. ▪ “I got a job as a lifeguard this summer.” “Cool.”
b — used to suggest acceptance, agreement, or understanding ▪ “I'm sorry I'm late.” “It's/That's cool [=okay, all right]—don't worry about it.” ▪ “Is getting together Friday cool with you?” “Yeah, I'm cool with that.” ▪ I thought she'd be mad, but she was cool about it. 6 of a color : suggesting cool things
▪ Blue and green are cool colors, but red and orange are warm colors. 7 informal — used for emphasis in referring to a large amount of money ▪ He's worth a cool million.
▪ a cool breeze ▪ The weather is cool today. ▪ The surface is cool to the touch. ▪ The plant grows best in cool climates. ▪ I'm feeling a little cool. ▪ a cool refreshing drink ▪ It's cooler [=less warm or hot] in the shade. ▪ This is the coolest [=least warm or hot] summer on record.
▪ We changed into some cooler clothes.
▪ It is important to keep a cool head in a crisis. = It is important to keep/stay cool in a crisis. [=it is important to remain calm in a crisis] ▪ She remained calm, cool, and collected. ▪ He is a cool customer. [=he is someone who remains calm and is not easily upset] ◊If you are (as) cool as a cucumber, you are very calm and able to think clearly often in a difficult situation.
▪ Even in the emergency, she remained as cool as a cucumber. ▪ The reporter was cool as a cucumber despite the confusion all around her.
▪ a cool reply ▪ He replied with a cool “I don't think so.” ▪ She was always cool toward strangers. ▪ We were surprised by the cool reception we got.
▪ cool sunglasses ▪ The car has a cool new look. ▪ You look cool in those jeans. ▪ a magazine article about the coolest places to live/work — often used to show approval in a general way ▪ Your brother is so cool. ▪ That was a really cool [=good, excellent] movie. ▪ “I got a job as a lifeguard this summer.” “Cool.”
b — used to suggest acceptance, agreement, or understanding ▪ “I'm sorry I'm late.” “It's/That's cool [=okay, all right]—don't worry about it.” ▪ “Is getting together Friday cool with you?” “Yeah, I'm cool with that.” ▪ I thought she'd be mad, but she was cool about it.
▪ Blue and green are cool colors, but red and orange are warm colors.
— cool·ish /ˈku:lɪʃ/ adjective
▪ a coolish day ▪ coolish colors ▪ He was a little coolish towards us.
/ˈku:lɪʃ/ adjective ▪ a coolish day ▪ coolish colors ▪ He was a little coolish towards us.
— cool·ly adverb
▪ “Is that so?,” she asked coolly. ▪ My idea was received coolly.
▪ “Is that so?,” she asked coolly. ▪ My idea was received coolly.
— cool·ness noun [noncount]
▪ the coolness of the mountain air ▪ I was surprised by his coolness towards us. ▪ He always displays coolness under pressure.
▪ the coolness of the mountain air ▪ I was surprised by his coolness towards us. ▪ He always displays coolness under pressure.
