Ingenious = very intelligent or skillful, inventive, very smart and clever.

• An ingenious person/idea/machine/solution etc.
• The new computer boasts a number of ingenious features.
• He devised an ingenious solution to the problem.
• (noun) ingenuity.

Ingenuous = ( often derog)( of a person or their behaviour) naïve, artless, frank, over-trusting, inexperienced.

• Only the most ingenuous person would believe such a feeble excuse.
• It was rather ingenuous of her to ask a complete stranger to take care of her luggage.
• He seemed too ingenuous for a reporter.
• (noun) ingenuousness.

Intelligible = that can be easily understood ;  clear to the mind.

• When you address primary school students, use only the vocabulary intelligible to them.
• Due to some interruption in the telephone only some of his words were intelligible.
• His speech was intelligible even to the laymen.
• Intelligible speech/explanation.

Intelligent = having ,showing intelligence ;  brilliant.

• Reshma is a very intelligent and hard-working girl.
• He had a few intelligent things to say on the subject.
• He writes intelligently about the current political situation.
• An intelligent boy/question.

Observation = (1) the act of closely observing or monitoring someone or something ; scrutiny ; close examination.

• According to the doctors the patient needs to be under medical observation for a week.
• Movements of planets are under the close observation of scientists.

(2) something that you have learned by seeing or watching and thinking about it.

• She has good power of observation.
• This book contains observations about the causes of cancer.
• The court observed that if bail was granted to the accused, there was a chance of the evidence being tampered with and the witnesses influenced.

Observance = convention, custom ; following of certain rules , rituals etc.

• The manager insisted strict observance of rules while discharging the duties.
• Some people give undue importance to the observance of religious rituals.
• My grandfather is strict about the observance of family conventions.

Terrible = extremely bad or serious, causing great fear or horror.

• The heat is terrible in Delhi during summer.
• What terrible food they gave us!
• His behaviour is terribly bad.
• The weather in Nagaland is terrible during winter.

Terrific = very good, great, causing fear.

• Mammootty looked absolutely terrific in the movie ” Oru vadakkan veeragadha”.
• This book is going to have a terrific influence on the youth.
• They chased the robbers at terrific speed.
• You have got a terrific opportunity to fly to the US.
• Dr.K.J.Yesudas , popularly known as ‘Ganagandharvan’ , is a terrific Indian playback singer and an accomplished Carnatic musician.

Appreciative = feeling or showing gratitude, pleasure ; understanding.

• The opening lecture of his course was listened to by a large and appreciative audience.
• He was an earnest and appreciative student.
• I am appreciative of your efforts to improve the lots of orphans.
• He smiled appreciatively at her.
• Her novel received a number of appreciative reviews.
• I am appreciative of the support and help given by you in my extremities.

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Appreciable = considerable, substantial, large or important enough to be noticed.

• Pupils may have to travel appreciable distances.
• An appreciable amount of liquor is being consumed in Kerala , which is not a healthy trend.
• He perceived an appreciable difference in the enthusiasm of students after the new principal took charge.
• After using chemical manures , there was an appreciable improvement in the agricultural productivity.

Exploit = (verb) 1- make full use of and derive benefit from (a resource).

• We should exploit our scarce resources in the most scientific way.
• The company should try to exploit the new technology for growth and expansion.
• The government should adopt ways and means to exploit the untapped natural resources.

(2)  use selfishly for one’s own profits  , make use of (a situation) in an unfair way.

• Some companies are trying to exploit child labour ruthlessly.
• They exploit the situation through legal loophole.
• They are exploiting the migrant labourers without providing them with the shelter as agreed by the contract.

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Exploit = (noun) bold and adventurous act. something unusual , brave or funny that someone has done.

• They were telling us about their exploits while travelling around Africa.
• The exploits of Alexander the Great.
• He was narrating his wartime exploits to the villagers after his retirement.
• There were a series of colourful exploits in the circus tent.

Note:- For verb, the stress on the second syllable and for noun on the first syllable.

Awesome = amazing, wonderful, extremely impressive, inspiring awe, respect and admiration etc.

• He has made an awesome achievement.
• Mary looked awesome in her dress.
• Science can show us the awesomeness of nature.
• Nehru Park is a place of awesome beauty.
• Her performance was awesome!
• The street is awesomely quiet.

Awful = very unpleasant , horrible, terrible, nasty etc.

• The backyard of his house smelled awful.
• His handwriting is awful.
• She has an awful behaviour.
• The food they served was awesome but the place they selected and the ambience were awful.
• It was an awful experience to talk to him.
• You look awful in this dress , you should go and have a change.

Comprehensive = complete and including everything that is necessary.

• This is a comprehensive list of all the important aspects to be considered.
• This book gives a comprehensive account of the functional aspects of English.
• The government plans to introduce a comprehensive legislation to safeguard the interests of the migrant labourers.
• The museum has a comprehensive collection of antiques relating to Tippu Sultan era.

Comprehensible = easy to understand , intelligible, able to grasp etc.

• He explained all the technical details in a language comprehensible to the laymen.
• The terms of the agreement are written in clear , comprehensible English.
• The old legendary works of literature have to be translated in a style comprehensible to the new generation.
• The philosophy behind the writings need not be comprehensible to the school children.