
kläglich
pitiful
In a way that arouses pity or regret; pathetic or miserable.
Der verletzte Vogel bot einen kläglichen Anblick.
The injured bird made a pitiful sight.
pitiful
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pitiful
In a way that arouses pity or regret; pathetic or miserable.
Der verletzte Vogel bot einen kläglichen Anblick.
The injured bird made a pitiful sight.

miserably
Refers to a failure or defeat that happens completely and often in an embarrassing way.
Der Versuch, die Vase zu fangen, scheiterte kläglich.
The attempt to catch the vase failed miserably.

plaintive
Describes a sound that is quiet, whining, and sad.
Aus der Kiste drang ein klägliches Wimmern.
A plaintive whimper came from the box.
The adjective 'kläglich' (pitiful) is derived from the verb 'klagen' (to complain/lament), which means 'jammern' (to whine) or 'sich beschweren' (to complain). Something that is 'kläglich' is therefore, in a sense, 'pitiful' or 'deplorable'.
Nach der Niederlage war die Stimmung in der Mannschaft kläglich.
After the defeat, the mood in the team was pitiful.
'kläglich' (miserably) is especially often used as an adverb in the fixed expression 'kläglich scheitern' (to fail miserably). This emphasizes that an attempt has failed completely and often in an embarrassing way.
Sein Plan, alle zu überraschen, ist kläglich gescheitert.
His plan to surprise everyone failed miserably.
In the meaning of 'erbärmlich' (pathetic), 'kläglich' (pitiful) often describes a state or sight. Typical nouns here are 'ein kläglicher Anblick' (a pitiful sight), 'ein kläglicher Zustand' (a pitiful state), or 'ein kläglicher Rest' (a pitiful remainder).
Vom großen Kuchen war nur noch ein kläglicher Rest übrig.
Only a pitiful remainder of the large cake was left.
When 'kläglich' (plaintive) describes a sound, it always refers to something quiet, sad, or miserable. It is often found in combinations such as 'eine klägliche Stimme' (a plaintive voice), 'ein klägliches Geräusch' (a plaintive sound), or 'ein klägliches Miauen' (a plaintive meow).
Das Kätzchen machte ein klägliches Geräusch, weil es Hunger hatte.
The kitten made a plaintive sound because it was hungry.
pitiful / pathetic
Both words can be used to judge a very poor performance or a failed attempt. Kläglich focuses particularly on the pitiful or embarrassing failure, while erbärmlich places greater emphasis on extreme poor quality and often contempt. Use kläglich when emphasizing the failure, and erbärmlich for harsh condemnation.

Sein Versuch, die Aufgabe zu lösen, scheiterte kläglich an der ersten Frage.
His attempt to solve the task failed miserably on the very first question.
Sein erbärmlicher Versuch, die Aufgabe zu lösen, zeigte kaum Verständnis für das Thema.
His pathetic attempt to solve the task showed hardly any understanding of the subject.