One Word Substitution

Answer :

(1) flippant (Adj.): showing that you do not take something as seriously as other people think you should

(2) flip side (N.): different and less welcome aspects of an idea, argument/action

(3) flip-flop (N.): a type of foot-wear

(4) flintlock (N.): a gun used in the past

Answer :

(1) indifferent (Adj.): having/ showing no Interest

(2) indisposed (Adj.): unwell

(3) indignant (Adj.): feeling/ showing anger and surprise because you think that you have been treated unfairly
(4) indigent (Adj.): very poor

Answer :

(1) somnambulism (N.): the act of walking
around while you are asleep
(2) insomnia (N.): the condition of being
unable to sleep
(3) somnolence (N.): the state of being
almost asleep
(4) sleepy head (N.): a way of addressing
somebody who is not completely awake

Answer :

(1) rendition (N.): the performance of
something (a song, a piece of music) ;
interpretation
(2) reparation (N.): the act of giving
something to somebody/doing something for
them in order to show that you are sorry for
suffering that you have caused

Answer :

(1) infallible (Adj.): never making mistakes
(2) inestimable (Adj.): too great to
calculate
(3) indifferent (Adj.): having/ showing no
interest in somebody/something
(4) inevitable (Adj.): that you cannot
avoid/prevent