महाभारतः mahābhārataḥ - book-6, chapter-59, verse-6

तदाश्चर्यमपश्याम श्रद्धेयमपि चाद्भुतम् ।
भीमसेनस्य समरे राजन्कर्मातिमानुषम् ॥६॥

6. tadāścaryamapaśyāma śraddheyamapi cādbhutam ,
bhīmasenasya samare rājankarmātimānuṣam.

6. tadā āścaryam apaśyāma śraddheyam api ca adbhutam
bhīmasenasya samare rājan karma atimānuṣam

6. rājan tadā samare bhīmasenasya śraddheyam api
ca adbhutam atimānuṣam karma āścaryam apaśyāma

6. Then, O King, in battle, we witnessed Bhimasena's superhuman (atimānuṣa) deed (karma), which was both amazing and truly worthy of belief (śraddhā).

Words meanings summery:

• तदा (tadā) - then, at that time

• आश्चर्यम् (āścaryam) - a wonder/marvel (wonder, marvel, surprise)

• अपश्याम (apaśyāma) - we saw, we beheld

• श्रद्धेयम् (śraddheyam) - worthy of belief (śraddhā) (worthy of belief (śraddhā), credible, trustworthy)

• अपि (api) - also, even, indeed

• च (ca) - and, also

• अद्भुतम् (adbhutam) - amazing (amazing, wonderful, marvelous)

• भीमसेनस्य (bhīmasenasya) - of Bhimasena

• समरे (samare) - in battle, in war

• राजन् (rājan) - O King

• कर्म (karma) - deed (karma) (action, deed, work (karma))

• अतिमानुषम् (atimānuṣam) - superhuman (superhuman, beyond human, extraordinary)

Words meanings and morphology

तदा (tadā) - then, at that time

(indeclinable)

आश्चर्यम् (āścaryam) - a wonder/marvel (wonder, marvel, surprise)

(noun)

Accusative, neuter, singular of āścarya

āścarya - wonder, marvel, surprise

अपश्याम (apaśyāma) - we saw, we beheld

(verb)

1st person , plural, active, past imperfect (laṅ) of apaśyāma

Imperfect tense, 1st person plural

Derived from root dṛś, with augment 'a-' for imperfect tense.

Prefix: a

Root: dṛś (class 1)

श्रद्धेयम् (śraddheyam) - worthy of belief (śraddhā) (worthy of belief (śraddhā), credible, trustworthy)

(adjective)

Accusative, neuter, singular of śraddheya

śraddheya - to be believed, credible, worthy of faith (śraddhā)

Gerundive

Derived from root śrad-dhā (to believe)

Prefix: śrad

Root: dhā (class 3)

अपि (api) - also, even, indeed

(indeclinable)

च (ca) - and, also

(indeclinable)

अद्भुतम् (adbhutam) - amazing (amazing, wonderful, marvelous)

(adjective)

Accusative, neuter, singular of adbhuta

adbhuta - amazing, wonderful, marvelous, supernatural

भीमसेनस्य (bhīmasenasya) - of Bhimasena

(proper noun)

Genitive, masculine, singular of bhīmasena

bhīmasena - Bhimasena, a son of Pāṇḍu

समरे (samare) - in battle, in war

(noun)

Locative, masculine, singular of samara

samara - battle, war, conflict

राजन् (rājan) - O King

(noun)

Vocative, masculine, singular of rājan

rājan - king, sovereign

कर्म (karma) - deed (karma) (action, deed, work (karma))

(noun)

Accusative, neuter, singular of karma

karma - action, deed, work, ritual action (karma)

Root: kṛ (class 8)

अतिमानुषम् (atimānuṣam) - superhuman (superhuman, beyond human, extraordinary)

(adjective)

Accusative, neuter, singular of atimānuṣa

atimānuṣa - superhuman, beyond human, extraordinary

Compound type : prādi-samāsa (ati+mānuṣa)

• ati – beyond, exceeding, very
  indeclinable
• mānuṣa – human, human being, pertaining to man
  adjective (neuter)