Awkward or clumsy in movement, speech, or manner; stiff or unnatural, often implying discomfort or lack of familiarity.
初対面なので、ぎこちない挨拶になってしまった。
Because it was our first meeting, my greeting came out awkward.
彼は緊張しているせいか、ぎこちない動きで話した。
Maybe because he was nervous, he spoke with awkward movements.
ぎこちない笑顔を無理に作る必要はないよ。
You don't need to force an awkward smile.